I've had my 26g tank for almost a year now, and yes, shame on me, I have yet to buy new lights. My question is, can corals bleach because of a change in spectrum of lighting? (aka lighting wearing out and not being as effective?) or is it only because of too much light/stress? I've got montipora bleaching out, and all the mushrooms on the bottom of the tank are thriving and doing great. Help? I can post pictures later. All parameters are fine, except slight increase in nitrates, checked them yesterday. I did a nice big healthy water change to help, but is it purely just because of the lights? And what order do I change them in to avoid too much stress?