If it's bacteria bloom, which sounds like it is since you have a newly set up tank, your best course of action is to get some old gravel from a matured, cycled tank to seed the bacteria in your gravel.
If you can get live mulm (fish shit and dirt siphoned from the gravel and kept alive by aeration while you transport it home) You can use that to "shit" (seed) your filter.
This, plus dense planting, introduction of a small school of fish and immediate fertilisation IME is way cheaper and faster to get the tank's bacteria colony started and thus "cycled" than any of the commercial preparations.
Warm regards,
Lawrence Lee
brothers, whatever is true, whatever is noble, whatever is right, whatever is pure, whatever is lovely, whatever is admirable--if anything is excellent or praiseworthy--think about such things.
Philippians 4:8
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