Congratulations!!
Yellow tinge might be from bogwood if you've got any? Some carbon in filter for a couple of weeks will remove it if you're bothered.
You want to get nitrAte below 20, so in these circumstances where no fish in tank, you can do 75% water change, tha should do it.
Edit: sorry forgot to say if you aren't getting some fish in within a couple of days, keep adding ammonia to feed bacteria.
What fish are you getting? You need to balance not adding too many at once, with adding enough together that they feel secure in their shoal.
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