do you think your frogs eat any of the centipedes?i think the c02 would kill slugs.as far as i know,all insects need oxygen and flooding the tank with co2 for a few hours should kill them.the good thing about co2 is that its heavier than air so it should penitrate the soil and kill anything hiding in there was well.you have to be carful though becuase it cant be left in there more than say 12 hours because plants need oxygen also.i read about this volcano that was spewing out co2 and it killed all the plants in the area,the story mentioned how plants use co2 and how they thrive in a co2 rich enviornment but the roots need oxygen to survive and when the soil gets drenched with co2 for too long it will kill everything.i actually bought a small co2 tank last week when i was battling phorid flies but they left on their own.that is unless there are larva in the soil waiting for another attack.if they do ill be ready for them this time

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