Since i have a reef tank i guess i'll put this in the reef fish forum. The other day i was in my LFS and I started comparing different frozen foods. I was noticing subtle differences between most of the foods. The biggest difference being PE Mysis versus every other brand of mysis. I guess it's probably a dumb question but, what is the difference between frozen foods? Is there one? Why is PE Mysis significantly more expensive than the others? The reason I pose these questions is because I stive to feed my fish a varied diet with pellets soaked in selcon in the morning and rotating frozen at night. Currently I feed spirulina brine shrimp, mysis, squid, and krill rotating. Sometimes combinations. I just want to keep my fish fed with the most nutritous products to keep then as healthy as possible. Can anyone help me to sort this one out? Or is there no real difference?