Originally Posted by Jerthunter
I have heard and it has warnings on the product that says to be sure to rinse it as the dust can be harmful to certain corals. It also says for a reef tank not to run it constantly. That being said I run it fairly regularily and have not noticed a problem with any of my corals.
How regularly do you run it? I'm using it now to get rid of some diatoms, but I'm not sure if I want to take it out now that the job is done, leave it in, or run it once in a while.