Bypassing Overhead Filter Made Easier

I needed to bypass my overhead filter because I am medicating the tank. I turned off the filter and blocked the exit pipe by raising the filter box. I wedged a plastic aquarium gravel shovel under the box so that the water cannot drain out. Then I filled the filter box with tank water which it is sitting in now and so all the filter media is submerged. It should keep the beneficial bacteria alive until the meds are removed n a few days time.