I am wondering what Is going on with my tank? I'm on my third month, since I set up a 40 gallon tank. I added 3 sm. hermits and they are doing great, they are all over the tank like crazy now for about 2 months now, but it seems that every time I try adding damsels they do good for about a week or two then die, this last Friday I bought one domino and a four stripe and they only lasted till Monday morning, I did a water sample at a lfs
, and I have no ammonia, and he just said I have very little nitrite and hardly any nitrate, that I should be fine to add fish in a week. Now why is it that the hermits are doing great and the fish are not, my salt is at 1.021 any suggestions, will help thanks.