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I don’t know the reason for the differences. You cannot fool the API test to give you such an intense color. The API results are likely closer to the truth.
Gosh those are very different, if your sure you followed all the steps to the letter and both test kits are within their expiration dates. I could only suggest a third test kit (even if it’s just a newly purchased API to verify) or a retest after cleaning the vials out with RODI. I don’t agree with testing for ammonia once in 4 weeks, maybe that was a joke towards the laid back approach but it’s good to track ammonia. A few reasons come to mind like, to know that you had it to confirm the cycle has started, how well your tank establishes bacteria to combat it (in case you need to add more bacteria) also how much comes off your substrate and if there are any spikes or flare ups after it starts to near zero. This is how you know your cycle is complete. After confirming your test kits are accurate of course ;Happy