I have a 40 gallon freshwater tank with 5 red minor tetras, a weather (dojo) loach, 4 giant danios, 5 black skirt tetras, a pictus catfish, a yoyo loach, and 1 blood fin tetra. I'm running an Emperor 400 and two internal Whisper 30i filters; two airstones, and a U.V. sterilizer. Now down to my question. . . I have two 36" 30 watt bulbs running on a Coralife electronic two bulb ballast. The lights go on at 11:30 am and off at 10:00 pm. I feed the fish once, every other day. One of my bulbs is a Coralife Color Max bulb and the other is a standard 4200K fluorescent from the Home Depot. I've got an out of control brown algae problem that I can't figure out how to stop. I've noticed that the gravel in the front of the tank right under the home depot bulb is covered in the brown algae, while the gravel in the back that is shaded by decorations, but gets dim Coralife bulb exposure, has no algae at all. Is it possible that the home depot bulb is giving off a spectrum of light that is favorable to algae that aquatic bulbs wouldn't?