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I have a low light 20 gallon (1wpg) that I grow crypts and anubias in. As far as ferts go I add nothing. I change the water(50%) and clean the filter once every 4-6 months.

I believe it is more important to add nutrients to the roots for low light tanks. However my substrate is mostly silica sand with some cichlid gravel mixed in it. I have 2 Africans in this tank so adding root tabs isn't really possible. So with no nutrients at the roots and no ferts added I have 95% algae free tank. Some green spot on a few rocks. However the growth is at glacial rate.

Robert. (bobo31)
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