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This page will give a completely detailed profile of the selected fish, from A to Z. The profiled fish will be chosen randomly by Badman, and will come from the complete genre of tropical fish. New profiles are added on a regular basis. If you would like to submit a profile for the site please contact me. Don't forget to let us know you experiences with this fish by filling out the



knight goby

Stigmatogobius sadanunidio



    Seen more and more at the local shops the Knight goby can be an attractive addition to your aquarium.
Quick stats:


    Listed tank sizes are the minimum
    Size: Up to 3" (8cm) Total Length
    Tank: 20+ gallons
    Strata: Bottom mostly, middle
    PH: 7.5 to 8.5
    Hardness: Medium to hard . dH range: 9.0to 19.0
    Temperature: 72°F to 81°F (20-26°C)


    Order: Perciforms
    Class: Actinopterygii (ray-finned fishes)
    Family: Gobiidae
    Sub-Family: Gobionellinae
    Genera: Stigmatogobius
    Species: sadanunidio

knight goby

Common name:

    Knight Goby

Image gallery:

    Additional species photographs


    Badmans' Forum


    Asia: India to Indonesia.

General Characteristics:

    Striking in its own way the night goby is always pleasing to the eye. The base color is a pale gray. The body is speckled with a series of small black dots covering most of the body. The pectoral, anal and tail fin are fringed with a line of white. The Dorsal fin has a large black splash in the back

Aquarium Set-up:

    Territorial by nature, the aquarium should have plenty of places to to hide such as caves, driftwood and plants. They will defend their space and if you are keeping more than one extra care will have to be given as the are aggressive toward their on species. The aquarium itself does not have to be extra large a twenty gallon long would be great, aside from the above the substrate should be a sand material rather than gravel. Being sensitive to poor water quality you must have good filtration and a strong maintenance schedule.. Lighting is best subdued as they are timid in bright situations. Considered a brackish fish according to  fishbase   they actually prefer freshwater, be sure to ask your supplier the conditions they have been kept in.


knight goby



    Should not be a problem, prefers live but will take most flake, frozen, dried or sinking pellets


    While not an active predator, the knight goby will eat smaller fish in the aquarium, being shy you would not want to keep them with overly aggressive species like the larger cichlids.


    Occurs in estuaries and tidal zone of rivers


knight goby


    No wide scale successes, sporadic reports of breeding are reported with little luck of raising the fry. It is thought that rotifers would be the first food of choice.

Personal Experiences:

    I have never kept this species but one reader has had the following experiences. They are awesome fish I've had 6 for about 2 years. They like any kind of worms black,blood,tubiflex .And about the brackish water you should check with the shop you got him from and see if he was bread in brackish or fresh but a little salt wont hurt any way. They also like a high Ph about 7.2 to 7.8 any ways they are awesome little fish but if they are not fed lots they may go after the other tankmates fins.

Your comments:


Please remember that the following comments are personal experiences and may or may not apply to your setup. Use them as guide to help better understand your fish, like us all individuals will behave differently under different circumstances.


From: Thea
Over 10 years ago I had one of these beautiful fish in a 75 gallon freshwater community tank. I always ran my tank with aquarium salt at 1 tbs per 10 gallons. I fed a good flake food twice daily and every 2-3 days fed a frozen blood worm cube by hand This fish would swim right up into my hand and stay there. They have quite a personality. My children's favorites in the tank were our knight goby and our green spot puffer because they were so interactive with us. The goby I had then was a female I think, loand as much hiding places as I had she was never in hiding,always out and about the tank and finding a perch here or there. I never had an issue with the fish being territorial or chasing and just loved the personality she brought to the tank. I had her for several years then gave my tank and all its inhabitants to a friend as I was moving and couldn't take it along. In the last year I have begun fishkeeping again, and was so happy to have found this fish. Initially I added my new knight goby to my community 35 gal,but it proved to be very aggressive in my tank. I love this fish though and have set up a 10 gal with several serpae tetras that were also to nippy for the larger aquarium. It's working well and I do just adore my goby. This fish though is much more of a hiding fish. I see it out usually when feeding .Not sure if tank size is the issue or if it's more of just the individual fishes temperament. Also tried to add fiddlers crabs to the tank and had to act fast because goby thought they were food. Still, though this fish is more challenging than my last, I just love the personality in this breed of fish. I am going to try setting up a brackish in a new 25 gal and maybe the size,water parameters, and brackish tankmates will make him more comfortable, so perhaps I can see more of this wonderful little fish.
From: Thea
I have a 55gal tank and its a mix of black sand with a aquarium gravel and river rocks. baby plants, and drift wood. I have only had my knight goby for a few weeks, and ohh.. I lover her. I have always wanted to own a goby. I always liked the personalities I see at the aquarium shop near me. She is technically still in a freshwater tank, granted I do add aquarium salt to the tank, as my original fish (6yr)common pleco is more active.. Before he just hung out in his log and rarely did anything then I tried so salt and he has been active for all of 5 years. I also have 8 rainbows don't know what type, and 3 marble hatchets, all seem to be happy with a bit of the salt. My pleco likes to be hand fed, and the goby is getting in on it to. I discovered that she like algae wafer, cucumbers, cantaloup (which is rarely given) and the slandered blood worms,etc. my pleco has been spoiled from the beginning and get adamant after a few days with out a treat, but from what I have read about the fish I have they really like verity. I hope to get a few more Knight Goby's, but I want to wait tell my plants mature more and have saved enough for the 250gal I have been eye balling. I was amazed that she took bits of food from my hand and I hadn't had her for a week even. She has her hiding place's but most of the time she is out and about. From reading on how shy they are she is social butterfly with the other fish, hanging out with the rainbow's then hanging out with the hatched then the pleco.. wow. no chasing or fin nipping. and the pleco has no problem sharing his log once in awhile with her.. that's a new one. he has never like shairing his log. dynamic's of the tank.. i know migh seem silly but i just love her.
From: Josh
I have had 3 knight gobies for around 2 years now. While most sites say they prefer freshwater, I keep mine in a medium salinity brackish setup, around 1.010-1.012 ppm. They live happily with 4 scats, a mono, mollies, and a black fin shark cat. They are big eaters for their size and will readily devour large chunks of scallop. I believe I have 2 males and one female, as 2 of them are slightly larger and display much more beautiful colours, which range from white to blues to gold. A very beautiful fish when happy!
From: Brock
So I would like to add some info to this thread, if you get a knight goby make sure you have it in water of 1 to 2 tablespoons of salt per gallon, knight gobies ARE brackish fish and need salt in there life at some point. if you are for some odd reason forced to keep them in fresh water, and only fresh water, (it is ok to go back and forth between the two) make sure at some point in there life they end up in salt with a minimum 1.005 salt, maximum being 1.20 right before marine, but ideally they should be kept between 1.005 - 1.160, i have 2 that i keep with a figure eight puffer, they are all very friendly with each other. Ii keep my salinity at 1.140 and they are very healthy and happy, almost fat because they like to eat so much
From: Lisa Grant
These are amazing little fish! they are such a character! my knight goby just loves blood worms and I do 25% water changes weekly and put 2 tablespoons of salt in per gallon and he is very active and healthy. I strongly recommend that salt is added to a knight gobies' tank. before I put salt in, he was not active and was not looking very healthy. Even though they are classified as fresh and brackish water fish, a brackish environment is much better for the overall health and happiness of this fish. These are truly amazing creatures!
From: Daniel
We had 8 Knight Gobies in our community tank for a few months. They have a striking blue patch on their dorsal fins, which appears black on younger members. If you feed them well, they grow quickly. These fish have a great personality, and the way they move is fascinating (everyone should have a goby!). We sold ours to our lfs because out of the blue they ate 5 otocinclus and 3 hillstream loaches in one day. We wanted a small fish community tank, and so switched to bumblebee gobies, which work great!

For enthusiasts wary of a specialized brackish setup... a brackish setup is optional in areas that have natural limestone aquifers, as the calcium carbonate in the water ensures a high pH (sometimes over 8, even!). You can get away with mixing fresh and brackish fish with this water and a tablespoon of salt/10 gallons if you don't mind disrupting the breeding habits of your freshwater fish.

From: Nick
I have had a few night gobys for about a year now. From my experience with them I can honestly say that giving them meat pellets and occasional algae wafers will make them more lively. Literally every single time I would place a few of each in my tank, the gobys would go insane over them. Most of the time they would consume one whole pellet and maybe half of another. But when I provided algae wafers in addition they would eat the pellet as usual and consume the wafer as if they had not eaten in weeks. However these are just eating habits. I had been examining their actions after feeding for most of the year and noticed a substantial increase in activity. When I had first purchased them and got them acclimated to my tank conditions I fed them just some basic fish food. And after feeding them for a while with it I got the notion that they were inactive and simply boring fish to have around. Then I decided to change their diet. Immediately I noticed the increase in energy and general activity. I would seriously suggest using meat pellets and algae wafers for them. Search these fish items on the following website: This site/company is excellent and provides very high quality products for all your fish keeping needs. They have excellent customer service as well.
From: Steve G
Hi everyone,regarding the Knight Goby, a few years ago I acquired 4 of them, I was told to keep them in fresh water, and I did that. They got sick, refused to eat, and 6 weeks later were all deceased. I was very disheartened by the whole experience. About a year ago I got some Dragon Gobies and set up a brackish tank for them. A 4 ft long 55gal, and they were doing very well in it. I came across 6 Knight Gobies, and decided to try them again, but this time in the brackish tank. Although they were in fresh water at the store, and I was again advised to keep them in fresh water, from the past research I decided to put them in the brackish tank. They all all doing wonderfully, and very healthy, growing like crazy, and very active. I took 4 inch flower pots, and broke a piece out of the side of each, then set the pots upside down, with the broken out piece being a doorway for them, and they immediately laid claim to all 5 pots. I know I have at least 3 females a s they are very heavy with eggs right now, and I have one large dominant male, so maybe (cross my fingers for good luck) I'll get some babies out of them. I strongly suggest if you get some of the Knight Gobies, that you set them up in a brackish tank. Start with fresh water if that is where they came from, and then slowly increase the water salinity with Marine salts, (do not use Aquarium salt, rock salt, coarse salt, pickling salt etc. = Marine Salt only) with each water change over the next month, doing weekly water changes of at least 25% (I do 50% weekly). I keep mine in a brackish salinity of 1.010-1.015, and everyone seems very happy, active and eating voraciously, and in the case of the Knight Gobies, maybe even getting ready to breed. They need hiding places, and seem to love the inverted flower pots, with two exits, one out the top where the drainage hole is, and the other where I broke out a piece to make a door at the bottom. They prefer a soft sandy bottom, I use Aragonite sugar grain sand, and that also helps keep the pH up. I use a top quality canister filter on the tank, and an air stone at the bottom bubbling away. I also have a small power head submerged at one end to give some current, as this is common in Estuaries and brackish river areas. I have plastic plants as the Dragon Gobies keep rearranging them. The Knight Gobies are entertaining, and can be quite lively. The are an intelligent fish, and peaceful too. If you're considering a brackish tank, do your research and then go for it. The Knight Gobies can be kept in smaller tanks like 20 gal or more. They prefer the bottom to middle areas, but will come to the top for food. They eat just about any fish food I put in the tank. They also play with the Mudskipper, which is interesting to watch. Enjoy and practice good fish husbandry. Steve
From: Matt
I have two knight gobies that I keep in my 55 gallon tank. I have kept them with 3 green spotted puffers and 3 mollies. They all get along well although when I first added the knight gobies they ate all of the neon tetras that I had at the time. At first I kept them in only freshwater but now I keep the water at a specific gravity of 1.012 They get along well with each other and love to try to eat the rosy reds but the puffers always get them first. They will eat flake food and just about any frozen or freeze dried food I have tried.
From: Shellie Ramey
I have kept 2 knight gobies in a brackish set up along with 4 mudskippers and a red claw crab for nearly 2 years. They have thrived and seem very content. They will eat anything smaller like crickets or feeder guppies, but also relish white worms, tubifex, flakes, brine shrimp, bloodworms, etc. They will display to each other occasionally, probably protecting their territory. They seem not to bother neither the crab or the mudskippers. I do believe they are more brackish water than freshwater species. Any time I have seen them in fish shops they are being kept in freshwater and have fungus on them or are "wasted" looking through the stomachs. I think the brackish water keeps them healthier.
From: Blaine
After keeping these guys I must say that they are quite interesting to watch. They seem to chase everything around the tank but never seems to harm them, maybe a quick little nip as if to say "get out of my territory". These have to be one of the few fish, that if raised from fry in freshwater, do not necessarily require salt in their water. I know that they prefer to be in spots that are full of vegetation or hiding spaces and that they prefer to hunt for their food at night. I currently keep mine with Celebes rainbows, green tiger barbs, odessa barbs and various fancy plecos. GREAT fish to keep (so long as there are no smaller fish for it to feed off of!)





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