how do you folks remove algae from your gravel?should I soak it in a bleach solution, or boil it? will I risk an ammonia spike if I clean large amounts at a time from killing off BB in the gravel? Also, I only have my lights on for 8 hours a day max and am still getting quite a bit of growth. Is there something else I can do without having to put chemicals in my water? Also, do the blue lights grow algae as much as the white lights?