A 65 gallon is actually 36" long (25" tall and 18" wide). I'm not familiar with ATI, but after looking them up I found them to be 'very pricey' $450 - $500 and appear not to be for a 'Low Tech' Planted Tank, rather for High Tech or Saltwater Inverts. I want to have a total of about 110 watts, but not much more as I'm not running CO2 (only use Flourish Excel). I currently use two Coralife Aqualights on my 37 Gallon and they've served me well for 5 years, but thought I would look for the next level up in light fixtures, but only want to spend $100 - $150