- Jul 25, 2019
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currently my 30 gallon has fertilizing dirt on the bottom, then a layer of black sand, and a layer of gravel on top. i was wondering if i could get any sort of bottom dweller for my tank ? everything that has been recommended to me so far and everything i have found online (cory catfish, loaches, etc.) all seem to prefer sand over gravel or can only be kept in sand. can i keep any sort of bottom feeders with a gravel substrate ? if yes, would they be ok with angelfish? i’ve seen red sharks and khulis loaches be kept in tanks with gravel on some youtube channels.