Hello, I have a 90 g new set up, that will become a peaceful community/reef tank. My question is, can I have 3 goby's in there together? I want a yellow watchman, a diamond, and a firefish. I have about 80 lbs. of rock forming multiple caves, dwellings, to hide in. I have ready many things about having 2 together, but not much on 3. Am I trying to push the envelope too far?