For areas where tap water has lower pH and KH
Two optional types of potassium
GREEN BRIGHTY NEUTRAL K, which does not raise pH or Carbonate Hardness (KH), has been newly added to the liquid fertilizer series. New BRIGHTY K (alkaline) and GREEN BRIGHTY NEUTRAL K efficiently supply potassium that often can be depleted in planted aquarium. You can choose based on water quality of tap water, kinds of substrate materials/aquatic plants or types of layout.