If you havea sump you can suck the falt worms into 2literbottle turnedinside out and cut in half stuffed with filterfloss. Start the siphon and put the tube in the bottle, the flatworms will stay in the filterfloss and the water will go backinto the sump! Then find an old canister filter or a mag350 and fill it with carbon. Run this after you use the flatworm exit. It should cover the poisons emited by the die'n flat worms. Just an Idea.