ok picked up a frag of a light blue with grenish mouth oxypora. its about the size of a quarter and has 3 mouths on it. i got this frag on saturday morning and has been in the tank since. i just started to notice today when the light came on that on one edge it is turning a light brown color. its not algae but the coral actually losiong some color. i had it about bottom third of tank and have since moved it up higher and closer to the light. its under 250w 14K mh right now. it came from 400 watt mh but the light on the 400 w were kinda far away from the coral so i fighure its about same amount of light. is this common for it to brown out a little and then pick back up. all the frags i get are usually brown and color up nicely. this 1 is doing the oppisite so it has ma a little worried. any advice about these corals would be great.