Nitrate Removal


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May 8, 2021
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New Zealand
I'm trying to find the cause of my GHA. I've tried using RowaPhos and other phosphate removal. My water supply shows almost none before going in for top ups.

I get some algae on my glass as well, not much but some. I'm thinking maybe Nitrates? I test and get very low level. But my algae might be using t.

I have a 120L system and do a 10L water change weekly (every Friday).

What can I do to strip Nitrates? Should I do 20L changes? or 2 changes per week? or would that be too much?

Any other methods?
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