They're very easy to keep. They're omnivores, so they'll clean up any leftover food (flakes, worms, pellets, etc). Not likely to pass 6-7".
They are a nocturnal catfish, so they're more active after lights out, but they'll still come out for food in the daytime.
I have 3 and after they hit 4" the growth slows right down.
Also, they squeak and vibrate when you pull them out of the water.
Thanks for the info its really interesting about the squeak!!!
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He's 2 and half now. Hope he makes it another 20+ years