I’m planning on doubling the amount of plants in my 20 gallon long tank this week. I don’t remember all the species of plants in there now. I do have flourish root tabs in there now and have eco-complete substrate. My nitrites have never been above 5 with weekly water changes and a moderately stocked tank (pH- 7.4, ammonia-0, nitrites-0). Should I plan to use a liquid fertilizer in addition to the root tabs? If so what is your best recommendation? I have Excel but purchased it awhile ago without really understanding how it worked and I don’t currently have an algae problem.