The canadian version of aquarium water testing is out of business.
How are you checking P04 and NO3?
Something is fishy.....I had the same thing on my old 90g BB tank. My N03 was 20-40ppm.....algae didnt grow though and p04 was fine using a high sensitivity merk kit.
I think my problem was I let the detrituis build up in the bottom and around the rocks of my tank causing a NO3 problem. With a BB tank you really need to keep it clean.
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