Ok, i have 8 x 39w T5's, all of them are Giesemann aquaflora (come with the units). I have ordered 4 x Giesemann Midday T5 to give a more even colour band. I was just wondering what would be the best configuration. I have 4 razor edge units, 2 joined together long ways, spanning 2 metres. So 2 + 2. eg. at the rear 4 x Aquaflora, then 4 x Midday at the front. or at the rear 2 x Aquaflora + 2 x Midday, then 2 x Aquaflora + 2 x Midday at the front. What do you think. At present they all come on at the same time.