Buggy, what about just giving him a fairly constant cache of snails to choose from? As long as there are more than he would eat in the tank then they would be helping with the cleanup. All you would need to do this for free is a tank where the source snails could reproduce safely away from Mr Puffer. It is not an elegant solution, but it should keep things relatively clean and keep your puffers beak in check. After a while I bet you would know exactly how many you would need in the tank to accomplish your goals.
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