From experience, I'd say stock imported direct by your LFS (non-TMC stock basically) is more likely to eat than stuff bought from a Wholesaler... I haven't kept them long-term, but I do have to turn around a fair few emaciated Copper Bands at work. TMC Copper Bands are always hard work and are appalling to get to feed, if they ever do. Imports just need time and regular food and they are good for sale after 3-4 weeks usually...