I'm setting up a 36 x 12 x 16 tall and have a 1 or 2 x 39w t5 retrofit from one of my old reef tanks. The plan is to set up a lower tech tank to start. The light would be about 4" above the water in a canopy. Do you think 1 39w t5 would be too much light? Rotala Butterfly calculator says 28 par with no reflector which if its correct should be about right. My other option would be a Fluval 3.0 but it seems quite a few tanks I see are T5 lit. Anyways thanks for your time.