I have had that happen to me. Never figured out why!
Feeding may help. There could be something lacking in your water so I would kick up the water changes.
What are your water parameters?
What do you have for lighting?
It's not new to the tank. The tank is over 2yrs old. I guess i will try different placement. Right now it is on a frag rack in the upper right of my tank. pretty much right under the MH's. I will post new params as soon as I can.
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