Dude, I have two ap700's over a 450 as well and my tank is not only growing, but colorful as heck. Shoot me a message, maybe I can help dial you in.@Braodfield are you happy with the Aurora? Have you had good growth? I am looking to replace two AP700s with this fixture on a reefer 450. Would love to hear your feedback? BTW - have mixed reef which has been surviving but not growing :-(