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3 wpg over a 30g tank will require some additional form of carbon, either through co2 or a liquid treatment like Seachem Flourish Excel.....the alternative will be massive algae problems.

With no co2,you will see string/thread/fuzz algae, BBA, GSA, GDA, rhizo, clado, or any of about a dozen forms of algae.

For a tank with no co2, ~1.8-1.9 wpg should not be exceeded and no additional ferts will be required.

I'd cut your lighting down to 1.5 wpg and then just toss in some traces once a week until you can put in co2.
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