Hmmm.. interesting.. you could get a bottle of that Dr. Tim's bacteria to dose right after treatment is done to put the nitrifying bacteria back in the tank. When I dosed for the first time after reading Melev's link I was expecting the worst for the inverts in the tank, after all, the red bugs are inverts as well.. but suprisingly after 3 back to back doses per instructions there were 0 red bugs left and very minimal loss of snails (no crabs in the tank, but if the snails made it I would think crabs would as well). I think shrimp must be taken out though, I don't think they will make it at all.