Well any loose substrate can cause impactions. Peat is more organic than sand and should pass easyer but the risk is still there. One thing though, if your wetting the peat down I would be worryed about respirtory infections with your leo, as that is alot of moisture for a leo, also the thing about organic substrates is that bacteria grows carzy in them, esspecially if it is moist. Just my 2 cents

Leo

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