I made two large batches several years ago but stopped because it was too much pollution. Blending/chopping the food up produced particle sizes that were too small for most of my fish to care about. The Tangs preferred to graze nori off of a clip over the course of a day and the CBB only wanted to eat Mysis and clam so the krill and seafood medley was largely passed over. The lion fish and eel I keep are also no good at finding food that is just dropped into the tank, they have to be hand fed with tongs. Perhaps if I had a tank larger than 120gal with many more smaller sized fish it would have worked. At the time I followed the advice of this article from 2008: Do-it-Yourself Frozen Food by Steven Pro
http://reefkeeping.com/issues/2008-01/diy/index.php
I always thaw frozen foods before adding them to the tank. It isn't natural for most reef fish to feed from the water's surface and mine have never learnt to. Unless I shut off the return pump a block of frozen food would no doubt float on over to the overflow to the sump quite quickly.