Regardless of what many say, I believe in feeding phyto to a tank that is housing clams. They are filter feeders feeding on it in the ocean as well as needing major lighting. At one time I had 30 clams between 2 tanks. Both tanks were fed phyto. I had tiny ones and large ones anywhere from 6 months to over 4 1/2 yrs until some "clam plague" wiped out 29 of them. Ask 100 people how to run a reef tank and you'll get 100 different answers. Do what works best for you. I would be wary of it being between the rocks if it can't open as it grows.
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