I was wondering why the Chaeto in my sump was growing so slow....I found out tonight it was because the cheato in my OVERFLOW was growing like mad! I was blowing off my rock when I noticed a clump of chaeto floating in my overflow and I thought "hmmm...better remove that before it starts growing in there". I reached in there and pulled out a chunk of chaeto about the size of a football. It was LOADED with mini brittles too.