Agreed on Smo's post. There is no benefit to your extra additives, only potential harm. You can severely stress corals with that alone if levels get far beyond NSW
. Same goes for your alk
levels. Neither have any benefit to the system if elevated beyond NSW
, only potential harm.
As far as your corals looking healthy and then all of a sudden they look poor, it is more commonly environmental or chemical. Something has changed or "built up" to the point where the corals are distressed. See how the carbon does over the next few days and change it every day for the first while to be sure it's effectively sorbing anything nastey. The hard part here is not what you can test for but what you can't detect conventionally. The carbon will help with that if it's there. Water changes will also help.
As far as coral placement, that was not to help in terms of this situation but long term health. They will not will not do well in the years to come if left as they are.
Originally Posted by skoogie
The leather coral has a white all most powerly look to it. should this be a concern?
This does not sound good. If you could post a clear "up close and personal" pic it would help. Sounds like it may be necrosing. Have you seen any small or large debris falling free from it? Try fanning it gentley with your hand.