Tank is crashing :(

[Myka]

Originally Posted by MitchM

Your tank setup looks fine, but your tank has been through a lot of changes in the last 6 months including light changes, changing from dosing to a calcium reactor, alk fluctuations and the use of carbon dosing plus you have a mixture of lps and sps. You didn't mention if you were using activated carbon, so that may be a good idea to compensate for the allelopathy (chemical warfare) between your corals.
Bottom line I think your tank needs some stability, but start with a regular water change schedule.
Turn down the lights and increase water circulation. Water circulation is as important, if not more important than lighting.
imo

I totally agree with this!

I think the issues you're seeing is from the wild fluctuations in the tank and all the changes made. Get it stable for at least 4 weeks, then add a new coral to "test the water". Chances are that what you're seeing is damage from the past, rather than current conditions.