I wouldn't suggest it... it might be possible, but CPDs are so little, I'd just be concerned.
If you want somebody large but gentle, try a twig catfish. They're suckermouths who get about 7" long but are very slender. They don't move very much, but they tend to sit out in the open.
If you want somebody large but gentle, try a twig catfish. They're suckermouths who get about 7" long but are very slender. They don't move very much, but they tend to sit out in the open.