For the past couple of days in my 9 gallon I’ve had an explosion in flatworm population which is weird because I haven’t introduced anything in over a month. Because it’s a small tank I dont think I can find a predator and I’ve been advised against chemicals due to flatworms dying causing toxins and because its a small tank this will affect it drastically. Does anyone know if there is a predator or is it okay to just leave them in there and let them slowly overtime decrease in population?