my impression is that I would be more worried about the other fish than the gobie.
They are a rather agressive fish, and despite their small size than can give your other fish a good going over. My crown tail fighter often has extra nips out of his fins.
I kept some in my community tank without much trouble, although they tend to be picky eaters, preferring live foods. I found blood worms in a good current tended to be the food of choice although daphnia, white worms, and mosquito larvae are better if you can get them. They have a large appetite. I remember a time when I fed my fish a large amount of mosquito larvae, the larvae (large sized) accumulated at the bottom of the tank. The gobie then ate all he could, even though the larvae were almost as long as him. I don't know where he put the stuff. Hollow fins I guess.
They are a brackish water fish, and hence if you can add salt to the water they will appreciate that, however it is not necessary.
A species tank is also a good idea if you can set one up, and tailor the tank to the needs of the gobies.
Hope this helps
Matt