Yea with Arow's. I would just soak it if that was a concearn. For me I never really worried about it (to much) I gave it a thought as well as feeding shrimp with the shell on but my P's (the larger ones) just spit the shell out most of the time or didn't eat the shrimp with the shell's on them. As for the krill never really had any issues with it. Just make sure the frozen is completely defrosted.