I picked up 3 from rich at infinite aquatics just over a week ago and they're doing pretty good gorged on feeders right after being dropped in the tank about to start working on getting them to eat frozen. They have already accepted feeders from my tongs gonna try shrimp or fish fillet next.
They pretty much hang out with each other swimming goofily in the current and one will bumble across the tank explore a bit and then come crashing back into the group to resume the huddle of fat blind klutzes.
They don't seem to enjoy light and will swim away from it if possible. For the first couple of days they swam behind the rocks during the day or when my room lights were on. Now they swim out front most of the time until I turn the tank lights on then they go behind the rocks again, so not quite fully comfortable. They are definitely active at night. I watch them under lunar led lights and they'll swim all over.
Dunno how many Rich has left. I ended up getting cats that were a couple inches bigger than he advertised, if he measure head to tail at least.