^^Agreed. I make a standard mix, but also tend to feed just frozen. Since my mix doesn't rely on frozen fish foods (mysis, brine, etc.), and instead on fresh seafood, it depends on pricing of frozen vs. pricing of bulk seafood.
My mix usually involves shrimp (half shell on, half shell off, snap off all rostrums, but sometimes leave heads), squid (remove the pen, ink sack, and beak, use everything else) [no more than 25% by weight], and some form of bivalve (use everything minus the shell). Mince finely, mix, store in fridge for no more than 1 week. I'm still fine tuning it to see what works and what doesn't though. Ideally, I'd toss in shad roe or another small fish' roe post mincing, but since I don't eat seafood, that's....difficult.