in my tank, i believe the nutrients were coming from the rock. the previous owner did like to feed heavy
thats why in my case it took some months for the phosphate reactors to work.
the nutrients are in your tank, and they are feeding the algae.
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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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