I had a channel cat and i hated that thing. He was a pig and would come up the surface and eat ALL the food i would put into the tank for my cichlids. On top of that since they're such pigs they make a huge mess and in turn just make more work. I personally wouldn't recommend one.
That's odd. Walleyes loved them and these leeches. In spring when the rivers flooded into woods, walleyes will go to that area, munching up the earthworms out of mud like candy. I fed that walleye earthworms, leeches, maggots, waxies, frozen fish (smelts and minnows) and live fish.