It should be fine. What I would watch for is a change in pattern. Opening less frequently, not as full, etc. As long as it is opening regularly it should be fine. It does, however enjoy much meatier foods than just plankton. They like mysis, chopped krill, etc along with some cyclop-eze, oyster eggs, etc. Two of mine are in high flow areas, the third one is in a lower flow area. They all open on the same schedule. Mine tend to be open for a while at night, and a good part of the morning, but I think that depends a lot on when you feed them. I feed mine usually around 10pm and sometimes throw a pinch of food into the column at 8am as well.
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