for those of you wondering... i took out my yellow tang. and this goby killed the other two so now only 1. But now that there is only one he is out a lot, he used to always hid in the rocks with the others. So in the tank i have 1 firefish goby, 3 bangaii cardinals, 1 blue hippo tang, 1 royal gramma, 1 fiji foxface, 1 toadstool leather coral, 1 torch coral, 1 orange carnation coral, 1 huge sally lightfoot, 1 coral banded shrimp, and 1 skunk shrimp.