The appropriate level of phosphate in a planted aquarium is, on average (depending on the type of plants), up to 1.5 milligrams per liter. If the amount of phosphate in the aquarium falls below the plants’ needs, their growth will significantly decrease, as it is one of the main limiting factors for plant growth. Symptoms of phosphate deficiency include the appearance of brown spots on the leaves of plants (often on older plants) and, in some cases, the development of green spot algae on the leaves. Typically, deficiency symptoms appear first in older leaves rather than younger ones. On the other hand, high levels of phosphate can become unavailable to plants and, after the growth of unwanted algae in the aquarium, can lead to an imbalance in nutrient availability for the plants, causing them to turn brown and black, which ultimately leads to their death. Additionally, an imbalance between phosphate and nitrate can lead to the proliferation of unwanted algae.

Deep Ocean Phosphate Fertilizer can easily and safely increase the phosphate concentration in plants with quick absorption and completely eliminate the symptoms of phosphate deficiency.

* Made from USP-grade materials.

* The most specialized phosphate fertilizer for plant growth, color, and health.

* Formulated with a similar percentage found and readily absorbable by plants.

* Exceptional rapid effectiveness and noticeable absorption.

* High concentration and cost-effective for large-volume planted aquariums.

* Free of any nitrates (nitrogen), allowing it to be used in conjunction with nitrogen and potassium from Deep Ocean for optimal results.

* Safe for invertebrates like shrimp.

Basic Usage Instructions: Shake the bottle well before use, then add half a cap (2.5 cc) for every 80 liters of aquarium water once or twice a week or as needed based on symptoms of phosphate deficiency, such as stunted growth along with yellowing of the leaves or dark green color of the plants and dropping of older leaves.

Professional Usage Instructions: Before use, measure the phosphate level of the aquarium water using the Deep Ocean phosphate test kit.

Reference 1: Each cc of Deep Ocean phosphate fertilizer can increase phosphate ion concentration by 0.45 ppm in 10 liters.

Reference 2: 5 cc of Deep Ocean phosphate fertilizer can increase nitrate ion concentration by 0.112 ppm in 200 liters.

Note: Maintaining a relative ratio of 10 parts nitrogen for every 1 part phosphorus leads to stable plant growth without encouraging excessive algae growth, as an imbalance between phosphate and nitrate can cause unwanted algae.