My german blue digi has slowly browned out over the last month or so. It receives high light being right under my 250w mh but the bulbs need replacing I know. My Calcium has been high around 500 or so. It hasnt effected any corals and growth has been regular so I dont know if this would be a problem. All my other tests(ph, phosphate, nitrite, nitrate, ammonia) were on par I think with the kh being on the higher side at around 10 dKH. My temp gets around 81-82 during the day. It gets fairly high flow being in front of a koralia 4. My purple digi also browned out but it gets low light and I am pretty sure that is why. Any ideas?

Oh and it has been growing like crazy through all of this.