[Zoaelite]

Originally Posted by Snappy

I am very confused after reading this link.
http://www.sciencedirect.com/science...18e88315e12b13

It appears they add iron into some charcoal as a benefit. If it isn't the carbon that is the problem I'll need to go back to the drawing board.

Anyway you can have the actual metal tested in the carbon? If you can verify its Iron then I would say its back to the drawing board but if its something else that could be your culprit. (That being said I do see what seems to be rust marks on the photos you provided which would lead me to think it is iron rusting...). Excess iron in the fish tank could attribute to some algae problems (Which would explain everyone with dinoflaggelets and slime) but should not be toxic at those levels (When I tore down my 54g I found 5 completely rusted razor blades in the sand ). Greg are you finding that everything in the tank is angry at you or just the coral? What ever the solution I hope you are able to find it fast!
Levi