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#1
04-02-2011, 10:39 PM
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I'm one of those people. My system is roughly 220gal and I just change out a cup of BRS GFO once a month. I only have to clean the glass 1-2 times per week and my macro algae barely grows.
Start with a small amount and keep checking. If you discover that your levels are not dropping or continue to rise just add more.
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"We shall dive down through black abysses... and in that lair of the Deep Ones we shall dwell amidst wonder and glory forever." - H.P. Lovecraft Old 120gal Tank Journal New 225gal Tank Journal May 2010 TOTM The 10th Annual Prince George Reef Tank Tour 
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#2
04-02-2011, 11:04 PM
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I'm a little less technical about how I go about it. I started off following BRS' instructions and the HC stuff is expensive. I just decided my maintenance amount would be 1 cup per month regardless of levels. Actually I don't even test them. When I notice the algae on the front glass comes back strong in 2 days I usually change it out. So far once a month is roughly when that happens.
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