I have a 36" tank too. (40B), I'm using a Finnex Ray2.. it's considered "high light" and quite powerful.. actually it's an algae making machine on my non-high-tech tank. I think if I could of done it over again I would have gotten a less powerful light.. I've elevated it a bit and am going to add more floating plants so I hope that helps! I know my frogs weren't fond of it before I elevated it, I only run it 6-8 hours a day then switch to a Marineland Single Bright, which is about the weakest LED strip out there, the frogs tend to become more active then..