i just purchased 3 upside down catfish. they're in perfect health, all behave normally, (hide all day, swim all night) but my question is simple: how can i feed them? they don't come out when i put in flake food, and they don't show interest when i throw in a cube of tubifex worms in. the only idea i had was to throw in some sinking wafers after i turn off the light. they appear to be alright for now, as they graze off the underside or ornaments, but i hardly think its enough
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