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How deep is your tank?
How high above the water is the light?
Was the clam centered under it or off to the side?
For what it's worth, I've had a Maxima under AI Hydra LEDs (15 inches down in tank, lights are 4" above water line... BC29, non direct flow from MP20) for over a year and haven't ever fed it. It just gets light and I suppose whatever it filters out of the water. Maybe I should feed it, but it just keeps growing and seems content so I leave it alone!
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