=Hope That Helps
I haven't used a sump as I'm sure your aware the cabinet is not really designed for it.
I have a deltec mce 300 and some mechanical filtration using only polishing pads and phos remover (ocasionally carbon) and have never had 1 abnormal result during testing.
I'm just beginning calcium and magnesium dosing and am seeing great results with softies and some LPS
These are what I was referring too:
Arcadia Series 3 Metal Halide Light 150 Watt - Clearance Line - Tynwald Pet Centre
Aquarium Lighting | T5 Lighting - All Pond Solutions