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I already have one Pleco and I wondered if there would be any problems if I introduced a second of similar size into the tank as long as they both have somewhere to hide up
Commons get pretty big, around 14", you have 40 gal roughly? I'd rehome that pleco and look into a couple smaller types like bristle nose or rubber lip..
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Clown plecos stay small and more than 1 can be kept together also. Commons do get huge and are notorious for sucking the slime coat off of other fish, even eating small fish.