Monti cap dying from the center out?

[Kynzo]

This monti cap I have has slowly started to die from the center outwards. The new growth has been fully colored so I thought maybe it would straighten itself out, but after looking at it today I think I have to do something. Could it be from too high light and it has bleached? I thought it was brown from low light but now I'm thinking it's algae that has grown over the bleached part of the coral. The only thing I can think of is that it's getting too much light. My parameters are steady and perform regular water changes. I've dismissed the idea of too much light since this area of my tank only gets about 150 par but I don't know what else it could be at this point. Anyone have any ideas? Thanks

 

[Saltyreef]

What are your parameter values?