Heres my setup:
tank 6'x2'x2'
4 rows of PCs, from front to back:
4 x 6500K, 4 x blues, 3 x 6500K, 3 x blues
all on electronic ballasts...
Been running for a year now... switched from NO actinics to PC blues... it really brought out the greens beautifully, when combined with the 6500Ks... the...