CadLights 39G Signature

[Oscar]

I set up my Cad tank yesterday. As a newbie it is a little frustrating that with 4 rear chambers CadLights did not give any guidance on how to use them.

Hopefully you can see this image. I turned on only the actinics to reduce the reflection. So from left to right, while viewing from the rear, how do you suggest using these 4 chambers?

#1. This is shipped with bioballs installed. I was thinking of using these temporarily to get the bacteria count up as quickly as possible. If they are repacked in a mesh bag then they could all be removed and replaced wtih live rock rubble. 4" X 5" X 15" = 1.3G

#2. This appears designed for the skimmer. Someone suggested the UV light could also be installed in here. Although I am questioning using the UV light. It would kill both good and bad guys equally? 5.75" X 5" X 16" = 1.9G

#3. Refugium? The refugium light could be installed to shine from the top down or from the back. It is very deep, how best to utilize a deep refugium?
7" X 5" X 12.5" = 1.9G

#4. Return pump. Install heater here? 4.5" X 5" X15" = 1.5G

#5. (below refugia) 7.5" X 5" X 2" = 0.3G