Thanks for the advice Pandora. Actually, my daughter bought the 15 gal tank for herself & then decided she didn't have room for it so she let me use it. Now she's made room for it so I don't have much choice but to give it back to her. <img src="/images/graemlins/frown.gif" alt="" />
The filter is mine though, so I'll move that over to the 10 gal. I thought the group might be enough for a smaller tank, so I'm not surprised that you feel the same way. I do like those bumblebee gobies though - so maybe I'll see how things go for a couple of months & then go looking for one.
Thanks for your help. <img src="/images/graemlins/laugh.gif" alt="" />