Bumblebee fish are actually small gobies, generally referring to the fishes from the genus Brachygobius.
Depending on species, some are freshwater species (that can tolerate brackish water), some are brackish species, and some inhabit both fresh and brackish water. pH should preferably be 7.0 and above.
It is very unlikely that they will take dried food, so they have to be fed with frozen (e.g. frozen bloodworm) or live food. They are also slow eaters and will easily be outcompeted by fast fish, so you need to ensure that they get their share of food. A trick is to drop food just in front of their mouth.
Some information specifically on bumblebee gobies from the Brackish water FAQ of Dr. Neale Monks,
http://homepage.mac.com/nmonks/Projects/FAQ/6b.html
Also, do a search in the forum, there are more previous discussions relating to the fish. Have fun.
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