Aquarium plant fertiliser range — kits & compounds

The full Aquafertz aquarium plant fertiliser range

Browse our complete aquarium plant fertiliser range — from full PPS-Pro starter kits to individual top-up compounds. Copper-free, shrimp-safe, and free UK delivery on every order. Simple to order, simple to use.

Copper-free — shrimp safe formula

Pre-measured & ready to mix

No specialist knowledge needed

Free UK delivery on all orders

PPS-Pro aquarium plant fertiliser kit — complete solution

What it does

Nitrogen is the engine of plant growth. It’s a core building block of amino acids, proteins, and chlorophyll — the green pigment that powers photosynthesis. The potassium component supports water regulation, enzyme function, and overall cell health.

Benefits for your plants

Healthy nitrogen levels produce lush, deep green leaves with strong upright stems. Fast-growing stem plants show dramatic improvement in growth rate and leaf size. Carpeting plants fill in more densely and slower-growing species maintain better colour throughout.

Signs of deficiency

Yellowing starts on the oldest leaves and works upward — leaves pale from the midvein outwards, eventually turning entirely yellow. Growth slows and stems become weak and spindly. Always affects old leaves first as nitrogen is a mobile nutrient.

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Monopotassium Phosphate aquarium fertiliser compound 50g

Macronutrient · 50g

Monopotassium Phosphate (MKP)

Phosphorus for root development, energy transfer and strong cell structure.

£9

What it does

Phosphorus is a key component of ATP — the molecule plants use to store and transport energy from photosynthesis. It also plays a central role in cell division, root development, and the structural integrity of plant tissue.

Benefits for your plants

Adequate phosphorus produces strong, well-developed root systems that anchor plants and absorb other nutrients more efficiently. Some red and purple plant varieties show more intense colouration when phosphorus levels are properly maintained.

Signs of deficiency

Slow overall growth, poor root development, and a reddish or purplish tint on the undersides of older leaves — particularly on the leaf edges and veins. Like nitrogen, phosphorus is a mobile nutrient so symptoms always appear on older leaves first.

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Potassium Sulphate aquarium fertiliser compound 250g

Macronutrient · 250g

Potassium Sulphate (K₂SO₄)

Pure potassium for cell regulation, enzyme activation and plant resilience. No chloride.

£13

What it does

Potassium regulates stomata, activates dozens of enzymes, controls water movement within plant cells, and helps transport sugars produced by photosynthesis. It’s the plant’s internal logistics system. The sulphate form adds no unwanted chloride — important for shrimp and sensitive livestock.

Benefits for your plants

Plants with sufficient potassium are noticeably more resilient — coping better with fluctuations in lighting, CO₂ and temperature. Leaves are firmer and less prone to melting. In CO₂-injected tanks potassium demand increases significantly as plants grow faster.

Signs of deficiency

Yellowing along the margins of older leaves — edges turn yellow or brown while the centre stays green. In more advanced cases, small pinholes appear in the leaf tissue and edges may curl. Always affects old leaves first.

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Magnesium Sulphate aquarium fertiliser compound 175g

Macronutrient · 175g

Magnesium Sulphate (MgSO₄)

Essential for chlorophyll production. Prevents interveinal yellowing and keeps plants rich green.

£11

What it does

Magnesium sits at the centre of every chlorophyll molecule — it’s the atom that makes chlorophyll work. Without it, plants cannot photosynthesise effectively regardless of how much light or CO₂ they have. Particularly common deficiency in UK soft water areas.

Benefits for your plants

Adequate magnesium produces rich, deep green foliage across all plant types. The difference is especially visible in broad-leaved plants and stem plants — leaves look fuller, greener and more vibrant. Tanks using RO water often see the biggest transformation.

Signs of deficiency

Classic interveinal chlorosis — areas between leaf veins turn yellow while the veins themselves stay green, creating a striped or marbled appearance on older leaves. Most obvious on broad-leaved plants like Echinodorus and Cryptocoryne.

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Micronutrient · Copper-Free

Copper-Free Micro Mix

Complete trace element blend — iron, manganese, zinc, boron, molybdenum. Safe for shrimp.

£12

What it does

Trace elements act as catalysts for the enzymes that drive plant metabolism. Iron enables chlorophyll synthesis. Manganese supports photosynthesis. Zinc regulates growth hormones. Boron strengthens cell walls. Molybdenum supports nitrogen metabolism. Each is needed in tiny amounts — but remove any one and plant health deteriorates quickly.

Benefits for your plants

A complete micro supply produces vibrant new growth with strong green colouration. Red plants show more intense pigmentation. Stem plants produce denser internodes. Overall plant health improves visibly within a few weeks of consistent dosing.

Signs of deficiency

Always shows on new growth first — this is the key sign that distinguishes micro from macro deficiency. New leaves emerge pale, yellow or distorted. Iron deficiency specifically causes yellow new leaves with green veins still visible. Check pH is below 7.5 as iron availability drops sharply above this.

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Chelated Iron · 50g / 200g

Iron DTPA 11%

Chelated iron stable to pH 7.5. Prevents pale new growth and intensifies red plant colour.

£7 / £17

What it does

Iron is essential for chlorophyll synthesis but quickly oxidises and precipitates in aquarium water. DTPA chelation keeps it dissolved and available up to pH 7.5 — unlike standard EDTA which breaks down above pH 6.5 and is largely ineffective in most UK tap water.

Benefits for your plants

Reliable iron produces strong vibrant new growth. Red plants benefit most — iron is a precursor to anthocyanin pigments so adequate levels intensify red, orange and purple tones dramatically. Stem plants grow faster with shorter, denser internodes.

Signs of deficiency

New leaves emerge with yellow tissue but veins remain green — interveinal chlorosis on new growth. Always shows on newest leaves first as iron is immobile in plants. If dosing regularly but still seeing pale new growth, check pH before increasing dose — above 7.5 DTPA iron becomes unavailable regardless of how much you add.

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