I don't think its possible unless you use small mesh or enkamat to cover the top. Those slugs will try to go through any holes. I had one that got stuck in eggcrate when it tried going through a .5 x .5 square not realizing that its big butt is about 2"x2" big - kinda like the Santa Claus dilemma.
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If people don't die, it wouldn't make living important.
And why do we fall? So we can learn to pick ourselves up.
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