How old are your current lights? Are they T5HO lights? If they're about 2 feet long and at 24watts each then I imagine they are.
Power glos are at 10,000k I believe, while lifeglo is at 6500k. With three tubes 24watts each, you should have enough light to grow
almost all plants.
You'll always have algae, I just usually find you'll either have brown or green depending on how much light you have.
So apart from brown algae, is there any green?