Why are my corals dying?

[coralgazer]

Has your tank ran at 81F all year? Do you get temperature swings? I had to buy a chiller cause I couldn't temp steady in my tank. Has your alk always been that high? Your LPS and softies might prefer a lower alk. Be careful with large water changes while you're switching salts. That IO could drop your parameters too quickly, particularly alk. I think you are on the right track with allowing the parameters to slowly go down to the Instant Ocean levels
Is there sunlight hitting the affected side of the tank?

Might tank has always been 81-82°, no fluctuations but a little higher than I would like. Don't think I have room or $ for a chiller. no sunlight hitting the tank. The affected side is the "bad boy"corner, where I've kept hammer, torch, frog spawn, Kenya tree tucked in the back. No sunlight.

 

[Eienna]

Sounds like they're attacking each other when you're not looking. Maybe not enough to kill right away, but enough to cause damage and disease.

Even if they aren't touching each other physically, they may be releasing chemicals to fight each other.

Can you move them further apart from each other?

 

[coralgazer]

I don't think that's the problem; I did try moving the hammer to the other side of the tank for a week or 2, no real change. Also tried that with the torch, did not seem to stop the demise. I am stumped

 

[Stinger]

Personally , I think 80 plus temp causes diseases , I always run mine from 77 , no higher tha 79 deg F

 

[glb]

I was thinking the temp too.