Thanks Veriann for that reminder, I never thought anything about it. I will check. I am having a problem with crytobacteria right now. I don't think my water parameters are out. Everything is zero. I don't have a phosphate test kit. I don't know for sure what is causing it. I have been really careful about not over feeding. Are there any CUC that will work on this? I was wondering about an Emerald Crab or a Fighting Conch? Any suggestions?