Had a rust brown flatworm break out in a small QT tank. I added two emerald crab, a Pepermint shrimp, limpets , few snails and hermits. I have been sucking the flatworms out but they kept coming back but noticed today not many are left. I’m thinking the emeralds and peppermint have put a dent into the flatworm population. I just wished they would eat Calimorphs ....