In this 25 gal tank I use a cannister filter made for a 75 gal tank, as well as an airstone.
If the shrimp just shed at the store before I bought them I don't know, but they are not hiding out or anything. Matter of fact, today one of them walked openly around in the sand bank between my male zeb's lair and my female zebs' slate rock mountain. He does not seem to be afraid and so far all seems ok.
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