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I've got an upside down catfish but he never comes out from under "his" plant is this normal. When I do a gravel vac he moves out but then right back to his spot? You never see him swimming around.
Which upside down cat is it? The small ones (nigriventris) are schooling fish, and are more active in groups. The larger species are mostly singular/territorial.
They are indeed nocturnal and are most comfortable with a cave to hide out in during the day. I see mine when the lights are out and it's a joy to see them swim around.