I'm getting rid of peppermints for that very reason. Feeding until the shrimp are full is no less than a pain in the *** in itself, doesn't guarantee that it won't be hungry in an hour, and probably not an option with your nano due to wastes. And anyone that's fed lps knows that it doesn't matter if the shrimp finds the food an hour later, it will rip the food right out of the lps polyps. I can't get any growth out of my sun coral mini-colony because peppermints keep tearing the polyps to shreds. My solution is to give the shrimp away. Hopefully you find something that works.