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Many thanks 8)daizeUK said:High nitrites will indeed slow the process down because it takes longer to process them. I would do a 50% water change and see if that brings them back on the scale.
You asked if you should keep adding ammonia - no, not until nitrite zeroes out. If necessary you can add a small maintenance dose of ammonia every 4 days to keep the bacteria going, but not a full dose every day.