I've been doing a little reading on lighting and was wondering if the type of bulb would matter for watts per gallon. I am currently running an aquatic life 36" t5ho fixture on a 75 gallon tank that holds 4 bulbs. The bulbs are all different that's why I have this question. 1x67000k coralife, 1x10000k coralife, 1x actinic blue, 1xblue coral I believe. All are 39 watt fixtures. Is it correct to say 4 x 39 = 156 total watts from fixture. So 156 / 75 = about 2.08 wpg. So I have about 2 wpg or my setup. I guess my question is do the colors of the bulb matter? Another question what kind of bulbs would be best for using for my setup as I don't like the yellow water tint from just 67000k bulbs? I do use co2.