algae doesn't really come from not having enough plants, if anything, plants help to stop algae.
algae flourish on nutrients, light, and flow etc, however, plants use up said nutrients which means that if you don't overdo the fertilizing, you sould be fine. a personal experience of mine, is that the recommended dosage of liquid fertilizer is not final, i for a long time had problems with my plants not growing properly, and it was because i underdosed - i used the recommended amount.
i think it's a good idea to start low with the fertilizer and try to adjust the amount. also keep in mind that plants need to establish themselves in the tank for a few weeks before liquid fertilizer sould be used.