I’m planning on rescaping my 15 column this weekend to prepare it for some CRS. Currently the tank it pretty infested with pest snails. I’m planning on removing some of the current black gravel substrate and adding some sand to the foreground. Considering the current inhabitants will be in a quarantine tank, can I remove ALL of the gravel and maybe boil it before returning it to the tank? Do I have enough beneficial bacteria in my filter media to prevent a crash? Am I better off just tossing the old substrate and starting from scratch?