so i just brought a few sps and they were brown on arrival, my purple monti lost all colour, and is now coming back gradually, my acropora is brown but is purple towards the top, wondering if it will colour up from the top, to the bottom, and has good polyp extension, my pink hystrix is looking dull aswell, my params are, cal 450ppm, alk 9-dkh and both are stable, magnesium around 1400ppm, salinity 35ppt. and running 6 t5's. how long can it take for them to return to there original colours??