I am sick of algae and the demands of the higher light setup right now. As you guys know from my other threads, i have algae problems. I have a 65 watt aqualight over my 20 gallon. I am going to be mounting the lights over the tank with a diy method of my own. How many inches should the lights be above the edge of the tank to achieve an intensity of about a 2 watt per gallon set-up. I want the light to be strong enough to grow various stems like sunset hygro, red ludwigia, bacopa, and plants like pennywort, aponogeton crispus, dwarf sags, and marsilea minuta. These are the plants I have so how many inches should i raise above the top edge of the tank?