i have a 90 gallon mixed reef 48" long 24" deep tank. I am currently using an 8x39 watt sunpower. I’d like to get an idea of how high I should hang my light for a mixed reef tank. I had it@4" then 6" but I think that is still too close. I do not have access to a par meter right now. I am hoping @ATI North America or someone else can help me out. Does anyone have a similar setup and estimated par readings? I am using 3 actinic 4 blue plus 1 coral plus.