My fully cycled 60 Gallon has been doing really well chemistry-wise for a few months 0 ammonia, 0 Nitrate - 7.0 PH - recently the nitrites shot up and my water turned bright green. I have done water changes (30% twice in two weeks), and I'm running the Micron filter in my Marineland 350 Magnum - the algae bloom just continues to thicken!! What on earth can I do. The water changes aren't doing a thing!! There is no algae on any surfaces - just bright green water! Help!!!