Be careful on the LPS
corals, you could be experiencing polyp bail out but that is more typical with poor water chemistry, usually too high. The main concern to watch for here is brown jelly disease. More commonly brought on by a severe stress event that allows opportunistic bacteria to take hold. It will look like a cloud of brown goo hovering over the coral's polyp head. In a nut shell, the bacteria is consuming the coral flesh. The best way to deal with this is frag
any heads that are affected to help save the healthy ones. Never fan a coral affected by it or you spread it. Light infections should be syphoned off the coral. The addition of stabalized vitamin C is very helpful as will be regular liquid vitamins for aquarium use. Be careful on the dosage of C as it will lower pH. Also remove the carbon for several hours after each dose.
As Hara said change the carbon. I would actually suggest changing it daily for a few days and then at least weekly for a while. Glad to hear you use it regularly.
The only thing I can think of here would be an ammonia, heat or unseen chemical issue. The water changes and carbon use will definately help repair what can be. Just be diligent.
As for the SPS
, if the flesh is literally falling away it's more than likely the coral is a goner. RTN
is a serious "no coming back from" problem in most cases as Phyl points out. If just bleaching (turning white but appearantly retaining the flesh) I would still lean towards a chemical issue whether that be air borne or from the animals in the tank who knows. In any event, frag
the corals affected all the way back to the healthiest parts. Even if that means disposing of Â¼" or so of healthy bits. You want to make sure it does not spread further. Basically think of it as a fire break, you need to sacrifice some healthy parts to preserve the whole.
I would also let your chemistry fall a bit. The higher Ca
will be added stress to already stressed animals. Try maintaining the chem closer to 2.8-2.8 DKH
and 405-415 ppm Ca