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Suddenly NO3 is now 0?

April 26, 2017No3 suddenly

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Suddenly NO3 is now 0?

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I know low Nitrates are a good thing, but I’m concerned about the sudden change. At first, I thought my cycle had crashed inexplicably, but Ammonia and Nitrite have not risen at all. There are no live plants in the tank, so that can’t account for the change. It’s a 29G brackish system for guppies with a SG of 1.003. Right now we have 9 guppies in there with their fry making plenty of ammonia. pH is 7.8, GH is about 300 (too high?), and KH is also 300 (also too high?). As an aside, I’ve had trouble w/ pH stabilization due to low KH and I’m using a Rift Valley Salt mix recipe I got at WWM but it seems to make things stable but REALLY hard.