These catfish tend to be incredibly weak, due to how they are caught and shipped to the LFSs, who then usually underfeed their tanks. If you can get them eating and putting on weight with a good diet, they become "hard as nails", for example Tizer has three Chaetostoma milesi doing very well in a community tank. I bought a L444 this time last year and sadly saw it pass away several weeks later, almost certainly through starvation as I never saw it eat in a community tank (but then I could say the same about some of my Synodontis who are still healthy over a year on).
By all means, try the "rock painting" technique in your community tank, placing newly painted rock(s) in the same location as and when the old one is cleaned off. Placing the rock(s) in a relatively quiet are of the tank seems to help, away from the turbulent current.
What powerheads and filters are you using to create a heavily rippled water surface? You ought to be looking at 8x true water (eg. 2000lph in a 240l) turnover at least, if not more in the ballpark of 12x.