Hey Kevin,
Sounds like a cool modification you have done there.
In terms of a scrubber:
What you want to do is to position a plastic grid in a chamber , where the flow comes in from the top and have the water flow over and down this grid. Hope this makes sense ?
The overspill of light from the main lights should be enough to encourage algae growth.
Wish I could do this type of mod in my nano. Unfortunately on the TL450's the chambers are way too narrow to accomodate a "built in " algae scrubber of any kind.
BTW: Are you coming to the Gauteng MASA get together on 1 Feb ? You'll find details on the Local reefing clubs forum.
whre do i find the info on the local reefing clubs where meetings are announced?