I make mine out of leftovers from my dads sushi night at the restaurant, its all bacteria free sushi grade. I use:
Ahi Tuna
A Bit of Salmon (This fish is really oily, so not too much)
Octopus
Squid
A Very little bit of uncooked eel, EXTREMELY oily(Only for the Omegas)
Shrimp
I also soften nori, with some selcon or zoe, and then I mash it to a pulp, then add that, I strain out some fresh garlic juice.
Then I add a couple mysis cubes.
Then I use a rather large food processor.
Then To pack it away I bought some egg crate, cut it to size of freezer ziplocs, and spread the food into that, as evenly as possible. I have yet to feed this "new blend" but this is tailored to both my tanks.
However, I do use sushi roe (fish eggs) to feed my mandarin, he absolutely loves it. Only the orange variety mind.