I've just swithched all of my stuff to a new 90 gallon with 2 150 mhand t5ho for lighting. I've had it in the lower 3rd of the tank but it appears it's starting to bleach. What should I do? Move him to the sand? Put him in something where the light is somewhat covered by a rock? I did acclimate my lighting, i'm only up to 4 hours for the MH.