Hi I am new to the site. I have 2 52HD lights over a 90 gal saltwater mix tank. They are 12 inches over the water. The tank is 48 inches long 24 inches high and 18 inches wide. I was wondering what setting I should use any help would be appreciated.
Not sure if you've gotten any replies yet, but I have the same size tank, though just Hydra 52s (not the HDs). I have two Hydra 52s mounted longwise 12" over the water. In general what's been pleasing to my eye has been setting the UV and blues at 100%, red and green at 33%, and cool white at %66. Basically, cool whites at 2/3rds the blues, and red and green at 1/3rd the blues.
I have them on for 8 hours. It took my about 3 months to acclimate from about 35% power to where I am now.
Hope that helps!