Water Bowl "Substrate"

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Aha, thank you Crabinski! I will need to try a doubled set of containers. My E 'Master Roshi' has been splashing about and emptying the salt water bowl every day. I bought him a deeper pool I found in the reptile section because he was filling the tiny hermie-billed-water-dishes with sand every day. I wonder what he is up to! How can one little hermie clear out a two inch deep pool daily?

I'm wondering if he's transporting water in his shell to go moisten the sand/cocofiber, or to go wash other shells....

Like @purpleperson, my pools are made from plastic storage containers with craft mesh ramps. Both have river rock (pebbles) and a few flat scallop-like shells just loose on the bottom; very simple to clean as I'll just dump everything out, clean it all in hot water and dump it back in! The pools are doubled containers: one container is set into the substrate with about 1/2" above ground and has a layer of marbles atop which the second water-filled container sits -- makes it very easy for cleaning as the top pool can be lifted out and reseated without having to re-dig a hole in the substrate each time.