I am using 6 bulbs, 2 each of Aquasun, 50/50, and 03. The 50/50s come on first in the morning and the tank looks pretty purple. I have considered ditching the 03s, possibly running 4 aquasuns and 2 50/50s. I am not convinced that the 03s are good for anything other than compensating for low K MH bulbs. I must say, though, that running actinics alone can make the tank look pretty bizarre.