Dosing for coral growth

[MitchM]

Originally Posted by Coleus

i replaced my carbon every month and i am using premium carbon

Right, but how do you that it needs to be changed?

Alleopathy in corals is designed to be effective even in the vast expanse of the ocean. Another coral just needs to be down stream of another in order for the chemical to be effective. Never mind the dissolution factor.
How often do you put your hands in the tank?
How does that affect the corals?
What is the mix of corals that you have in your tank?
Maybe the mucous coating that corals shed has built up in the rockwork.

That could explain why Brad's new tank is experiencing good growth. No buildup of toxins yet.

Perhaps exchanging some corals with someone else would make a difference.

I'm just throwing out some suggestions, waiting for Hanna to come out with a test for toxins.