The last major determining factor in the health of your planted aquarium is the addition of liquid fertilizers. The amount of liquid fertilizers necessary will depend on the strength of the aquariums lighting and amount of additional co2 being used.

There are two main groups of fertilizers that will be utilized by your plants. The first is Macronutrients, these are – Nitrogen Potassium and Phosphorous. The majority of these elements occur naturally in the water and are usually supplied from fish waste, excess feeding and plant decay. With lots of plants in the aquarium there will be an inbalance of macronutrients and extra will need to be added depending on plant requirements.

The micronutrients are all the other elements used by plants that aren’t macronutrients. These are Iron Boron, Calcium, Chloride, Copper, Iron, Magnesium, Manganese, Molybdenum, Sulfur and Zinc. These can usually be dosed with commercial fertilizers. Most general commerical liquid fertilizers will contain a good ratio of these micronutrients in the necessary combination for the aquatic plants. In some cases, especially with red plants extra Iron may be needed to suffice the needs of some plants.

fishkeepers fertilizers

Seachem Flourish and NPK

Make your own


fertilizer for planted aquascape

Iron additives

Dupla fertilizers

fertilizers for planted aquarium


Most liquid fertilizers will provide aquatic plants with solutions of minerals and elements they need on a daily basis. From the first week of dosing there will be a visible difference in plant health,growth and plant color. Any serious planted aquascaper will want to trial a number of products and find a good median between price and impact. All aquariums respond differently to different fertilizers and it is important to use one you can trust and source regularly.