So far these are my favorite out of the 4 roach species I'm keeping right now. And yes they will eventually become feeders to my pyxie and pacman frogs
Lobsters are great breeders, I started out with 50 adults at the beginning of this year and now my colony is in the thousands. I feed about 50-60 a week to my animals.
Main food for mines are dry dog foods along any fruits or vegetables I have on hand, ground beef, boiled eggs, fish food (pellets or flakes), lets just say they'll eat basically everything
As for heating I don't use any extra sources but if you have a heat mat pretty sure they'll even breed faster.