LPS issue question - Greatly appreciate some assistance

[Psionicdragon]

Hello everyone,

I was at my friend's house and looked at his tank. His chalices are receeding, the acans are losing head, and the candy canes are dying.

A little background: my friend has approximately total tank volume of 225 gal. A few weeks ago, he received a bunch of bad / dying corals from his coworker. These were SPS that were just on the way out.

Most of the sps died during the next few days. He ran a full phosban reactor with Kent hi-end something carbon to take out the toxin. He left the phosban in for the next few weeks as it was still stinking of dead SPS.

So fast forward to yesterday, his chalices are receeding where you can see the skeleton. They were originally growing really well and same with the acan. He just tossed out a skeleton of candy canes that had over 75 heads that died within a few weeks.

My assumption was that the carbon removed so much stuff too fast and could've caused the corals to start reading. Another assumption is that the dying SPS overloaded his system and caused a spike.

He has done water changes multiple times during the past two weeks.

So what do you guy sthink could be the cause?

Thanks for the assistance

 

[Crush Coral]

Just changing the carbon in a reactor is not going to do much to remove toxins and more importantly polutants. Doing 3 50% water changes with high quality water and running a large canister filter with a lot of carbon changed every day or two would get his tank back to normal. I would want to run 1 liter or greater carbon charges in the canister.
Good luck.