When I get my acros they go straight to my acclimatization frag tank and adjust those leds as needed on a 4 week acclimatization periond gradually ramping up everyday till they get to the same par as the main tank. They will either acclimate fine but not grow or bleach or brown so ill move them around but theres no sweet spot. Some just don't seem to like this light or spectrum. I think if these leds were built more like halides and reflected off a reflector we would have greater success with them. IMHO I think they need to be indirect instead of direct lighting. Better spread and less bleaching and or shadowing which leads to the bleach effect.