So you all were very helpful with a snail problem...but one of my tanks currently has a centipede problem. They multiply like crazy! I read they aren't harmful to the frogs necessarily, but am worried about the eggs and plants. I read that some people suggest CO2 bombs- how do you do this? I would obviously have to take the frogs out first.... are they're any other methods that would work as well? How long does the Co2 process take?