Dragon: Sailfins do get biggish (arund 3-4" I believe), but they are peaceful community fish. They shold be okay with the bumblebees.
Im not sure of the exact species we get here are, but they only get about 4-5.5" max. with any luck, I might be able to get maybe a 55gal instead of the 20 so that it could keep these once they grow to their full extent. As far as I know and have read, they are a peaceful species that is also very slow growing and spends alot of its time 'plastered' to the aquarium walls. So, not too fast eating or moving as to scare the gobies. If not, I will just get the gobies and sailfins until I can get the 55gal or larger so that I can buy more gobies (deffinately), some flounders, and some other little peaceful fish. Maybe some nerites also (I have to do some research, but I hear they can live in low-end brackish.)
Mark