I got the flukes in with some Blue Rams when I first set this 55 gallon tank up. Probably hasn't been 4 years actually but it feels like it. Probably 2 and half to be more specific when I think about it. I had rams, diamond tetras and angels. I have went through a ton of Prazi Pro. It hasn't been bad for a while but I think they are still there and just held in check by the water changes and occasional Prazi Pro treatment. It is a 55 gallon and I only have 1 angel, 5 tetras, and 2 otos and I don't want to add any more fish into it. I am going to put my current fish and plants in a 30 gallon and keep separate equipment for them.