on a recent visit to my daughters room I thought she had a worse than usual algae bloom on closer exam it's flat worms I called the cr and talked to Dave he said flatworm exit would work but if too many died they might crash the tank 24g there is alot of them the rock is brown and the glass has large patches of them Dave said a spotted mandrine might eat them I know it's only a 24g but i have a 180 waiting in the basement to move my 55 fowler in it has lots of pods does anybody have any personal experience with a spotted mandrine will they eat flat worms thanks for the help