you can't really turn off any biological filter that will die back rapidly and not expect to take a hit when it comes back up.

as much as i like the principle of a hiatt, I am pulling it off the reef tank permenantly. even w/ the smaller usage of carbon reccomended it is about the only thing left i can think of that is causing my SPS to die back.

i just don't understand how some people have such great success w/ it, and bstreep and I failed so hard. :(