About a month ago I started to see this tiny, max is about 1/8 of an inch long, brown planarians. The are all over my sand and rock work. I dont know if they are the culpret but some of my corals seem to be going downhill. I seem to be creating alot of phosphates and nitrates too because I have red slime all over the sand too. I think this is from when I got rid of the plenum but left the plastic below the sand, I know my mistake. Anyway I'm breaking down the tank tomorrow, washing the sand really good and putting it all back together. Back to the problem, how can I get rid of this flatworms. The guys at the LFS said to go with a mandarin but I've never heard of a mandarin eating them. what do you suggest. Thanks.