Sorry, I meant, if you run floss to get the sand particles out to rinse the floss out often...it really catches stuff quick and if you don't keep it clear, when you stop the filter/pump sometimes the stuff will go back into your tank..I'm running floss myself now from installing a DSB
..just takes time to clear away..
Good luck on your corals. I don't know much about them yet, but these guys really know their stuff. Can't wait to pick their brains when it's my turn.LOL