the hard plastic ones they cannot climb. drill a few 1/2 inch holes a few inches from top around the edge. if they can get out the 1/2 hole they to small to eat anyway right? and if the pool is to small for 3 sx just put a cover on top pool. Maybe a piece of plywood or turn a round table upside down and lay on top. Never had the issue of any getting out pool though.
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