Thanks SM.

I'll go with 4" wide and 12" length.

I'll sort something out with the lights asap. Given the narrow light area, what is the minimum distance I can position the lights away from the scrubber? I'm considering using 1 CFL each side for now and see how this goes as I've reduced feeding.

Knocking the display lights out for a few days shouls be enough to give me the edge once the scrubber is established.