Aquatic plant fertilizers are to meet diverse plant needs in aquariums. Macronutrients like nitrogen (N), phosphorus (P), and potassium (K) are needed in larger quantities for growth, while micronutrients such as iron (Fe), manganese, and boron are essential in trace amounts for processes like photosynthesis and metabolism. Delivery methods differ, with liquid fertilizers offering flexibility and substrate fertilizers providing root-based nutrition.