2 1/2 to 3 1/2 is just fine. as long as your Pac can cover itself your fine. even if you add more they will still burrow down to the bottom. best to make them easier to find.
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Re: Substrate depth
2 1/2 to 3 1/2 is just fine. as long as your Pac can cover itself your fine. even if you add more they will still burrow down to the bottom. best to make them easier to find.
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