The theory behind the tank transfer method for treating Cryptocaryon irritans is to move a fish from one tank to the other when the parasites fall off the fish. This happens during dark times in the aquarium so moving the animal first thing in the morning is preferred. The parasites that fall off do not have the ability to complete the life cycle and re-attach. Since the originating tank is a QT tank, simply drain it, clean it, and reestablish it for the next tank transfer. The filter floss used as a seeded biological filter is tossed as is all water. Any PVC is sterilized and any transfer equipment as well. This depletes and eventually eliminates the parasites available to reattach and as a consequence will create a parasite free fish. This is not without stress to the fish but it is in some ways better than copper and just as effective as either copper or hyposalinity. I personally advocate a transfer not using nets.