Your not alone on this one Sneaker. I have an agressive tank, and i am constantly killing off aips. I have killed as many as 50 in one dosing. Still they come back. The problem is, you will always miss that one that is hiding in the back of your tank, under some rocks, in your overflow, or even in your tubing. I cant have any pepermint shrimp in my tank for more than an hour. They are snacks for my other fish. I cant have a CBB either. They stress too easy, first off and secondly, its too hard to find one that is big enough to survive a few minutes in my tank without becomming lunch. I have pretty much given into the fact that this tank will always have aips in it. I just try to keep them out of the front so you cant really see them. Although i do have a couple that are HUGE, and you can see them from across the room, at night, with your eyes closed.