hi am starting up my new planted tank i plan on having it very heavily planted and wanted to know what kind of liquid ferts to use if any

I dose with a micro fert such as seachem flourish, and macro ferts: potassium nitrate and potassium phosphate. Also nitrogen. If you don't have CO2, you may want to add liquid carbon such as flourish excel.

Some slow growing plants aren't as demanding in their nutrient needs and may be grown with no ferts added at all (so i've heard, i still dose my low tech tanks weekly)