Well that's really just scraping once getting the final pieces out. At a juvenile size I'd say your staple should be snails you breed yourself. Then fill in the rest with a variety you choose. It's not a huge issue right now. Yes it's good to get them on crunchy, but their beak doesn't fully fuse until a little later if I remember correctly. I posted a study on it i believe in twentyleagues dual fahaka tank thread.
Usually you'll start with snails then transition to big crawfish once bigger & your snails can't keep up as a staple. I've grabbed empty snail shells online then filled them with vitamin soaked meat as well. You can smear repashy on a rock. I try to stay away from a lot of thiaminese high staples for this type of puffer.