I bought two blue damsels (no yellow tail) for my 6 gallon nano from the LFS. One of them seems dominant. The other one stays in the caves. It comes out for feeding but soon becomes intimidated by the other one and retreats to the caves. There is physical damage done, just posturing. I am worried one will not eat and waste away. I thought damsels were social. I was wondering if they were labeled as damsels but they are actually chromis or something. Please help. Any info is appreciated.