nuclear pallys bleaching/ shrinking!

Tylers Reef

New member
ive had these pallys for the past 6 months and were spreading and looking wonderful. i upgraded and got 130w oddessy pcs, and about 3 months later they stared bleaching and shrinking. i do keep up with my water changes, but would this be due to too much light? i have zoos around the same area and they are doing fine...any suggestions?
 
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