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high nitrate levels - whats the best way to lower them?

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I just checked the water in my 6x2x2 after changing the water yesterday and found that my nitrates reading is like a crazy 160 ppm (which is the highest reading on the card). ammonia, nitrite checked out at 0 and ph around 7. temp is 27degs and filtration is via 2x 1800LPH otto external canisters

i know easiest way to remove nitrate is to change the water but i just changed like 200L yesterday in that tank and toowoomba is on pretty tight water restrictions.

Just wondering if anyone has had success with other methods or options available on the market.

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