Well, I've never used prawns, mussels or fish fillet like some have, only cos the husband would kill me as they're his treat! (Ours get earthworms or occasional beef/sheepheart strips). But I would remove the shell and give the soft meaty bit. Maybe just as an occasional treat. Better that you ask, I had millions of questions when we first started out, but I searched the forum and thankfully found most of my answers! Axies were a big learning curve for me considering I didn't want them at first and had never kept goldfish or amphibians.