My son and I bought two new fish. I asked about the Chromis and about the pygmy angel and explained what I have in tank already. Which is dragon goby, royal gramma, 2 perc clowns. The LFS guy asked me if the royal was aggressive I said no...he said to kind of watch him with the pygmy angel. I...

Hello everyone I am posting this because for the life of god I swear I do not understand what is happening in my system which the R.Gramma species...This is the second one that I have owned and I swear the first one just randomly up and disappeared from my tank one, day I broken down all of my...