buy frozen krill, brine shrimp. when I had P's they loved that stuff. also frozen beefheart. should have no problem finding this at LFS. the krill and brine shrimp will help them develop nice reds and beefheart helps them grow! Good luck, post some pics!!
edit: when they get bigger (like 2-3") you can start feeding them frozen tilapia from grocery store, just clean up what they don't eat .. and dont forget to "over-filter" that tank and do regular 50% water changes.. they make a huge mess!!