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Understood but he is in the same location for the past few years. The picture is mostly decieving. There is some diatoms on the sand I guess from vacuuming and disturbing the sand bed but not nearly as bad as the picture would indicate. I am also running new lights but this issue developed prior to the lighting changeThey can be finicky about flow and light. Move it around some and find a place that it likes.
Photo also looks like you may have some Cyano or detritus on sandbed, which could be building up and irritating it also.

