I recently added rotala hra to my tank it’s growing but all the new growth is green, think it may be my nitrates are too high for it, nitrates at 40ppm (same out the tap) any top tips on how I can get the nitrate down more tank is very lightly stocked but every water change is boosting the nitrate back up, it was never an issue before but I’d like to get it lower to help get better reds