Here's my latest update/observations..
Recently i've noticed a few of my colonies lossing their color!.. NOT bleaching, but fading to a duller less intensive color.. a couple of colonies looked washed out like a pair of old jeans thats gone through the washer a few times.. no STN and polyp extension was still full..
checked all my water parameters; everything looked normal and within range.. at first i thought it was my lights, but everything was still growing pretty good; even my orange cap at the bottom of the tank.. so i changed out the bulbs anyways; colors still fading.. then i though maybe high nutrients, but ruled that out because the affects of hight nutrients are the reverse; corals would brown out (darken) instead of turning white.. so i started to read and read and read..
then i came across a post that suggested too little nutrients in the tank.. between the light feedings, bare bottom, high flow, rowaphos, carbon, and recent O3 addition, had my water become too clean??! i've noticed that there was very little hair algae and my valonia population was on a decline.. so i tested this theory by increasing the feedings.. sure enough, the palest colony began to darken up within a few days.
I'm not sure if it was a matter of time/maturing process, or just the O3 itself, but adding O3 really cleaned up the water chemistry of nutrients.. gives new meaning to the phrase "got detritus?"