I tested my water on my 150 today and the nitrates were at 80 ppm. I immediately did a 10% water change and will do three more today. I can do big changes because the water faucet next to my tank is freezing. What could cause this spike? I also had no ammonia and about .50 ppm nitrite. I'm worried now. Filtering the tank are two emperor 400s and a Rena filstar canister.
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