The neon gobies are my favorite but need to be social with at least two to four of them in a tank. You will only see it maybe if you are lucky, when it is feeding time. I love their antics and watching them clean fishes, however, when cleaning your tank, they feak out and hide often for days. Mine did come out after experiancing the first cleaning but never came out after the second cleaning. It has been over a mnth. I miss them terribly but will not purchase anymore. They eat food well and seem hardy, just are frightened easily. They do need hiding places but with the huge amount of rock I have they hid too well. If you have algea in your tank, a bi-color blenny is a great choice. Mine is bold, fun to watch and attempts to eat floating food debris. It is very cute and does not allow aggressive fish to bother it, as my six line wrasse tends to do.