Wheni first got my blenny he was always in the front asking for food, when I changed light from t5 to kessil he was always hiding and I thought it was just dark and afraid of the shimmer, still eats but not as good. I changed the light to reef breeder very bright like t5 with no shimmer but still hides above the filter when lights turned on and doesn't eat as good. My other fish are fine. what could be the problem? thanks