i wouldnt choose giesseman bulbs over other bulbs like ATI and korallen-zucht.
for ATI, i really like the look of 3 ATI blue+ and 1 ATI purple+. but if you're not looking too much into corals yet, go with something like 2 ATI blue+, 1 ATI Aquablue special, 1 ATI purple+.
as for bulb changes, it...