Your light will dictate your fert requirements once the CO2 is up and running.
Usually the demand will go up and as long as you have good CO2 even with a weaker light, you can have a good amount of ferts in the water without any issues.
I would try to keep NO3 close to 10-20 ppm and PO4 to 1-2 ppm. Use the seachem ones (expensive in the long run) or buy KNO3 and KH2PO4 for your nitrates and phosphates.
If you want to avoid a disaster now then buy the test kits for PO4 and NO3 and maintain the levels. Assuming you have good hardness then the only thing you will need better micro nutrient source using CSM+B.
Most people make the mistake of waiting for bad things to happen then troubleshooting the issues as they come which can be very frustrating since in most cases their plants die out before they figure out.
I helped my neighbor one time with a low light setup on 29 g. Never had any issues with algae and no CO2 injection. We set it up for 20 ppm Nitrate and 2-3 ppm phosphate. We seeded the tank for the 15-20 ppm K. I then gave my neighbor some of my home made micro/macro fert solution and the tank grew plants really well.
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