People freak over 30-40 ppms nitrate for a reason, it inhibits growth and promotes illness in any concentration. I have an almost OCD like habit of keeping my water below 10-20 ppms nitrate and even then I'm still doing a water change within the time the seachem prime has made it less harmful.
I've found 20-30% every 2-3 days respectively and then one large 50% or more change once every week or so plus pothos keeps my water under 10-20 as readable on the api liquid test kit
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Your post proves you lack any real education about water chemistry and fish tolerance.