So many people say so many different things about keeping these fish. The only thing they all seem to agree on is that they are cute. I recently bought 4 bbg's without knowing that they are brackish fish, and into the freshwater 280 L tank they went. I was real concerned once I found out, but they seem to be doing GREAT! They swim lots, and love to eat frozen blood worms. Each fish is different, each tank is different. With all the contradicting information out there, all I will say that is fact is, yes... they are cute.
There are a lot of fish tales about these beautiful little fish, gotta love 'em. I've successfully spawned the little dickens in a heavy brackish tank. I had 7 bumble bees in a 55 L tank. The only other thing in the tank was a large piece of finger coral and a sponge filter. The only food introduced was live brine shrimp and live blood worms. After conditioning them for 2 months I did water changes, 25%, with fresh water on a weekly basis. They swim into deltas and streams to breed. A pair laid 10 eggs which were soon eaten, but I caught the second spawn in time, another 10 eggs stuck to the bottom glass. Having already established a second tank, I moved all the adults to it and waited for the fry to hatch. I ended up with 7 fry, which would only eat live baby brine shrimp. One of those fish that are a challenge but well worth it. The fry were absolutely fun to raise!
These gobies are somewhat easy to keep. They are a brackish water fish and require small amount of salt. They are territorial and should be kept at a ratio only one for every 40 liters. They can withstand some pH flutuation as they live in estuaries, but any major changes and they'll go belly up.
I keep my bumblebee gobies in a brackish tank with puffers. I raised the salinity up to marine (1.020) and for some reason my bumblebees started to spawn. The six fry I raised from that spawning have never had a problem with flake food, even though the parents (whichever of the 4) will only eat frozen or live foods.
I put 3 bumblebee gobies in my 280 L community tank and they seemed to be very active and fitting right in. However, soon we began to see shredded fins on one of our guppies. A few days later, I watched one of the gobies bite the entire tail off of one of my glass catfish. The cat died the next day. I have since moved the gobies to my 140 L semi-aggressive tank where they probably should have been in the first place. In spite of their nipping however, they are still one of my favorites.
I added 2 Bumblebee Gobies to a brand new tank three months ago and they have since survived a switch from brackish to fresh wher my Mono, Plecostomus and 2 Dwarf Puffers died. These two guys are extremely hardy, living through very high nitrate, nitrite and ammonia levels. The tank has since settled and I have added two African Frogs. I have to second the comment made by someone else: you have got to see the frogs and the gobies together! The gobies sit on the frogs. They absolutely do it on purpose, as I have seen them maneuvering back and forth so they land perfectly on the frogs' backs. I will say that they had better coloring when the tank had salt in it (1.013).