i had the same problem but only with green algae. within 2days of topping up with r/o water, it was gone. then i went out and bought an r/o unit. you add up the 3.50/jug, the r/o unit will pay itself off fast.
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tanks:
120g w/starphire front, pm bullet 2 skimmer, yellow tang, emperor angel, niger trigger, spotted hawkfish, blue tang, flame angel and 120lbs lr
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