I would have to disagree with that comment. I have 24 striped and 2 spotted in a 4x2x2. They do hide quite a bit at first, but after a few months, maybe 6 at most, they will be out quite often. I have enough hiding spots in the tank were I would not be able to see any of them, but there are always a few of them out.
I find they really started to come out during the morning if i fed them NLS. Mine also like meal worms, krill and beef heart.
I also feed them at night time with the lights off, and they go crazy for crushed up Sera Catfish Chips.
I see them more than my bumblebee catfish.