Keep up the good work..you'll beat the algae!! Keep your nitrAtes low (less than 10 ppm), keep removing as much algae as you can (don't just brush it off), use a phosphate sponge, don't let your PC or VHO bulbs get older than 8-9 mo (I notice algae blooms when mine get 8 mo old) and be sure to soak all carbon in ro/di for a day or two prior to using it.