Hi, I've been waiting for someone to reply to this also! A couple months ago we had the same problem on the crushed coral just in a small area. We were given a little baggy of powder by the owner of our lfs. He said just mix half of this powder with water and pour it in the tank. It started to clear up in 2 days. Don't know what it was ???? But it worked! You only use a pinch of this powder stuff. Let's see what someone else say's. There is a cure anyway!
Pam
Go Texans
:cheer: