Hey guys. I've been seeing some signs of some sort of deficiency that I believe is potassium. Older leaves are yellowing, turning clear, and some have holes. My tank is 4 weeks in with the plants and all. 20 gal and heavily planted with 1.8 WPG and high intensity. I was wondering, I dose with flourish twice a week (recently and temporarily backed off due to algae increase) and it says it has .37% Soluble Potash (K2O), well is that enough? Or do I need to buy Flourish Potassium and dose it as well? Thanks for your time!