my thinking is that the closer we can create an environment that mimics the ocean for our fish, the better off they are. They do not eat flakes out in the big blue. They like plankton, krill, silversides, all which you can find in frozen food. All natural is the way to go. They already enhance foods like emerald entree with spirulina for health so their immune system gets strengthened. Just like natural foods are better for our bodies, frozen is better for our fish.
-Doc