Well, it probably works best for the more common fish like swordtails, guppies, bettas...LOL good point! Sorry I dunno!
Not sure about catfish. Tzuppy used to eat A LOT. No wonder he's still begging. Back when he used to eat more he'd be satisfied and sleeping on the bottom of the tank. Though idk what's with this new batch of worms causing him gas. And he seems constipated again. Hasn't pooped for 2 days now unless Bee has been... grazing on it.
Also, that pet shop doesn't do water tests -.- Pff...