I have added some corals to my tank over the past few weeks...
green star polyp coral
yellow leather fiji coral
Overall, they are looking "OK", although the green star polyp and the yellow coral have definite areas that look "injured".
I assume the green star polyp will be OK because it seems to be growing despite the abuse it has received.
But the yellow coral has what looks to be "bite marks" in it... little holes with a little bit of "fluff" like the inside of a pillow. And it is primarily remaining closed.
I have seen on all of my corals (except the mushrooms):
both peppermint shrimp(despite being well fed), dwarf red hermits, dwarf blue hermits, electric blue hermit, large turbo snail (on the GSP)... I also have a couple of "bad crabs" in my live rock that I have not been able to get rid of (the really hairy ones)... although I have not directly seen those crabs on my corals. (They rarely come that far out of the rock).
Perhaps some of these inverts are picking debris off of the corals, but something is clearly wounding it.
So will all of this work itself out? Do I need to do something to help the yellow fiji coral?
Tank info: 30gal, ph
1.025, T 79, Amm 0, N.ite 0, N.ate 0, Ca
400, Iodine sufficient... clown, dottyback...
Thanks for your help!