You do not need to feed Zoas, you can feed frogspawn but you certainly don't need to. I have never fed my frogspawn, bubble, or hammer and they have excellent growth and colour. I do feed my anemones raw shrimp (they each get a 1/4"-1/2" piece every other day). If you have a healthy stocking of fish, direct feeding isn't necessary, the fish waste will feed the coral. At this point in the hobby, I have more coral than I have ever had, and healthier than ever, without feeding any of them (I have an SPS tank, LPS/anemone tank, and a softie tank). The trick is water parameters, keep your calk/alk/mag in check and do frequent water changes, the rest will take care of itself. Boy I wish I had all of the money back that I have spent on additives, coral food, and supplements for the tank!
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