So I have had a real problem with green hair algae growing in my tank. So I talked with the owner of my LFS and told him I had a 150 watt jbj k-2 viper over my 20gal tank. I also have my lights run from 8am to 8pm. So we came to the conclusion that the algae problem was probably from my lights. So I have two questions. One, would a 70 watt bulb be to little for this tank? Two, how long would you have the light s on for? Any advice would be greatly appreciated