Once a day isn't the worst. Feeding in smaller portions multiple times through the day is better for your fish, and for your tank.
But the Dogface and Lunare need a far more meaty diet then just mysis and brine. Clams, scallops, squid, silversides, etc. No dry foods can replace the diet needed for these guys. I would also feed the Foxface nori (seaweed) every other day.