So i am currently setting up a 48" Aquatic Life Hybrid T5 Fixture with 2 A360W-E Tuna Blue Kessils. My question is what bulbs would be most recommended in the T5 part of the fixture?
This is largely personal preference (almost impossible to run a combination that wont promote growth) based on the appearance you want. I don't care for the blue look that many prefer these days so I used two Blue+, an AquaBlue Special, and a Purple+ following the recommendation from ATI that you can find here. I run the Kessils at 60% color (they produce the most PAR at this setting but I like the appearance as well).