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couple things they can be either getting too much or not enough light. Where are they placed in the tank and how much par are they getting. It could also be a bacterial infection and I would dip them in Iodine
They been there for over a month and yes I moved the light Down like 4 inche 3 weeks ago but had to bring it back up like 2 1/2 because my 2 caps didn't like it I wanted inpruve color but was a bad idea