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I have a 10 gallon tank with 3 tiger barbs, 2 bala sharks, a plecostomus, and a pictus catfish. In my tank i have a little treasure chest that the plecostomus and the pictus stay in all day. I was wondering if it is normal for a pictus catfish to stay in the chest all day, i understand that plecostomus are nocturnal, but i wasn't sure if pictus are. I see my pictus come out and night and very rarely come out during the day. When I see the pictus leave the chest during the day he swims at the bottom for a lap or 2 then retreats back to the treasure chest. Any suggestions? Should I remove the chest?