Steve, I have a neptune auto feeder and I feed a mix of neptune Crossover Diet and New Life Thera+. All of my fish seem to love that stuff. They all eat it. Sometimes I put some Nori in for the tangs, but they all look over fed to me. Obviously the FoxFace was a new addition and there is some adjustment (as in 3 feedings instead of 2). Anyway There is a fair amount of natural algae for the fish to eat.
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