2Hr Aquarist APT Jazz

2Hr Aquarist APT Jazz – Root Fertiliser for Planted Aquariums

2Hr Aquarist APT Jazz is a concentrated slow-release root fertiliser developed for planted aquariums, mature aquasoil and nutrient-depleted substrates. Its substrate-bound nutrients deliver potent ammoniacal nitrogen and essential macro and micronutrients directly to the plant root zone, supporting thicker, fuller new plant growth while rejuvenating older aquasoil.

Unlike conventional root fertilisers that may release nutrients rapidly into the water column, APT Jazz Root Fertiliser is engineered specifically for underwater use and gradual nutrient delivery through the substrate.

APT Jazz can be used with aquasoil or suitable fine-grained inert substrates and is particularly useful when an established planted aquarium begins showing reduced growth as its original substrate nutrition becomes depleted.

Available in 9 Capsules, 18 Capsules and 54 Capsules.

Why Use APT Jazz in a Planted Aquarium?

Aquasoil does not retain its original nutrient reserves indefinitely. As a planted aquarium matures, nutrients stored within the substrate are gradually consumed by plant roots.

APT Jazz planted aquarium root tabs replenish the root zone without requiring the aquarium to be dismantled or the existing aquasoil to be replaced.

APT Jazz is particularly useful for:

• Mature or nutrient-depleted aquasoil
• Heavy root-feeding aquatic plants
• Supporting stronger new plant growth
• Developing thicker and fuller plant forms
• Rejuvenating established planted aquariums
• Long-term aquascape maintenance
• Root-zone nitrogen supplementation
• Nitrate-limitation fertilisation strategies

Rejuvenate Mature & Depleted Aquasoil

Aquasoil naturally loses a significant portion of its initial nutrient reserve as plants consume nutrients over time.

APT Jazz is designed to replenish mature substrate with slow-release ammoniacal nitrogen and essential nutrients, allowing an established aquascape to regain valuable root-zone nutrition without replacing the existing substrate.

Instead of dismantling an established aquarium, APT Jazz capsules can be inserted directly beneath plants requiring additional root nutrition.

Phoenix Matrix – Root-Zone Nutrient Delivery

APT Jazz uses the manufacturer’s Phoenix Matrix, a combination of ammoniacal nitrogen and essential nutrients designed to repeatedly rejuvenate mature aquasoil.

The ammoniacal nitrogen is retained within suitable substrate and made available to plant roots rather than relying solely on nutrients present in the water column.

This makes APT Jazz particularly useful for mature aquascapes where plant growth has slowed as the original aquasoil becomes depleted.

APT Jazz Nutrient Composition

APT Jazz is a solid inorganic NPK (Mg) macronutrient fertiliser containing micronutrients and trace elements formulated for aquatic root fertilisation.

Guaranteed Nutrient Analysis

APT Jazz also contains trace amounts of Boron (B), Copper (Cu), Manganese (Mn), Molybdenum (Mo) and Zinc (Zn).

All listed nutrients are water soluble.

Why Ammoniacal Nitrogen?

Aquatic plants can efficiently absorb ammoniacal nitrogen through their roots.

Fresh aquasoil naturally provides substantial root-zone nitrogen, which contributes to the vigorous plant growth commonly observed during the early stages of a planted aquarium.

As the substrate matures, this nutrient reserve declines.

APT Jazz contains 13% ammoniacal nitrogen and uses slow-release root-zone fertilisation to replenish mature substrate and support stronger new plant growth.

Slow-Release Root Fertilisation

APT Jazz is designed specifically for aquatic use and releases its nutrients gradually through the substrate.

A single application provides root-zone supplementation for approximately 2 months, after which APT Jazz can be replenished where required.

This extended release makes APT Jazz suitable for established aquascapes where stable, long-term root nutrition is preferred over frequent substrate disturbance.

How to Use 2Hr Aquarist APT Jazz

Step 1: Identify the Root Zone

Identify the plants or groups of plants that require additional root nutrition.

APT Jazz is particularly useful beneath established groups of rooted aquatic plants and areas where growth has slowed.

Step 2: Insert the Capsule

Place the APT Jazz capsule directly underneath the plant root zone.

Insert it at least approximately 2.5–3 cm / 1–1.2 inches deep into the substrate.

Step 3: Space the Capsules

Use approximately:

1 capsule per 2.5 square inches / 16 cm² of planted substrate area.

Position the capsules beneath plants requiring root-zone fertilisation rather than distributing them unnecessarily throughout unplanted areas.

Step 4: Siphon Disturbed Detritus

If inserting APT Jazz disturbs accumulated detritus or substrate debris, siphon the disturbed material from the aquarium after application.

Step 5: Replenish After Approximately 2 Months

APT Jazz provides slow-release root nutrition.

Replenish approximately every 2 months where continued root-zone supplementation is required.

When Will You See Results?

Changes should be evaluated primarily through new plant growth.

Improvements may become visible in new leaves from approximately 7 days after application.

Root absorption occurs more gradually than direct foliar uptake, and existing old or damaged leaves should not be expected to rejuvenate.

Monitor newly produced leaves, plant density, colour and overall growth form when evaluating the effect of APT Jazz.

APT Jazz for Nitrate Limitation

APT Jazz can be particularly useful for aquascapers practising nitrate limitation.

This approach provides significant macronutrition through the root zone while maintaining lower nitrate levels in the water column.

APT Jazz uses substrate-retained ammoniacal nitrogen to provide nitrogen directly around the roots, helping reduce dependence on high water-column nitrate concentrations.

Nitrate limitation can contribute to stronger red colouration in suitable aquatic plants when lighting, CO₂, overall nutrition and plant health are appropriately managed.

Designed Specifically for Aquatic Use

APT Jazz is developed specifically for aquatic use with a controlled, slow-release nutrient profile.

Its formulation is designed to provide potent root nutrition while avoiding the rapid nutrient release associated with fertilisers that were not specifically developed for submerged aquarium use.

Can APT Jazz Be Used with Inert Substrate?

Yes. APT Jazz can be used with aquasoil as well as suitable fine-grained inert substrates, although nutrient retention differs between them.

Using APT Jazz with Aquasoil

Aquasoil and other substrates with good nutrient-binding capacity retain ammoniacal nitrogen effectively around the plant root zone.

This makes aquasoil the preferred substrate for obtaining the fullest benefit from APT Jazz.

Using APT Jazz with Inert Substrate

When using APT Jazz with inert substrate, use a fine grain size below approximately 2 mm with at least 4 cm substrate depth.

APT Jazz contains clay that helps improve local nutrient retention, but coarse gravel may allow nutrients to move more readily into the water column.

For maximum root-zone performance, APT Jazz is best paired with aquasoil.

APT Jazz with APT Feast Aquasoil

APT Feast provides substantial nutrition when a planted aquarium is initially established, while APT Jazz becomes particularly useful later as substrate nutrient reserves become depleted.

As an established APT Feast or other aquasoil-based aquarium matures and plant growth begins to slow, APT Jazz can be used to replenish nutrients directly within the root zone.

For a new nutrient-rich planted aquarium substrate, explore 2Hr Aquarist APT Feast Aquasoil.

APT Start and APT Jazz

APT Start and APT Jazz are designed for different stages of planted aquarium substrate management.

APT Start is primarily used during the initial setup of a new aquarium to enrich the substrate and introduce beneficial starter bacteria.

APT Jazz is primarily used later to replenish root-zone nutrients in mature or depleted substrate.

For initial substrate enrichment, explore 2Hr Aquarist APT Start.

APT Jazz 9 vs 18 vs 54 Capsules – Which Pack Should You Choose?

All three 2Hr Aquarist APT Jazz variations contain the same slow-release root fertiliser formulation. The difference is the number of capsules supplied, so you can choose according to aquarium size, planted area, number of root zones and how frequently you need to replenish the substrate.

APT Jazz is applied at approximately 1 capsule per 2.5 square inches / 16 cm² of planted substrate area, inserted at least approximately 2.5–3 cm / 1–1.2 inches deep near the plant root zone. Replenish after approximately 2 months where continued root-zone fertilisation is required.

APT Jazz 9 Capsules

The 9 Capsule pack is ideal for nano and smaller planted aquariums or aquascapes where only selected groups of plants require additional root nutrition.

It is also a practical choice for aquarists who want to try APT Jazz for targeted supplementation before moving to a larger pack.

Best for: Nano tanks, smaller planted aquariums and targeted root-zone fertilisation.

APT Jazz 18 Capsules

The 18 Capsule pack provides additional coverage for small to medium planted aquariums with multiple groups of root-feeding plants.

It is suitable for regular substrate maintenance where several planted areas require replenishment approximately every two months.

Best for: Small to medium planted aquariums, established aquascapes and multiple plant groups.

APT Jazz 54 Capsules

The 54 Capsule pack is the larger-value option for medium to large planted aquariums, heavily planted aquascapes or aquarists who use APT Jazz regularly for long-term substrate maintenance.

With three times as many capsules as the 18-capsule pack, it provides a convenient supply for larger planted areas or repeated applications as mature aquasoil becomes depleted.

Best for: Medium to large aquariums, densely planted aquascapes, multiple tanks and long-term APT Jazz users.

Which APT Jazz Pack Should I Buy?

Choose 9 Capsules if you have a smaller aquarium or only a few plants requiring root fertilisation.

Choose 18 Capsules for a small to medium planted aquarium with several planted areas requiring regular root-zone nutrition.

Choose 54 Capsules for larger or heavily planted aquariums, multiple tanks, or when you want a larger supply for repeated substrate replenishment.

The fertiliser formulation and recommended application method remain the same regardless of pack size.

Frequently Asked Questions

What is 2Hr Aquarist APT Jazz?

2Hr Aquarist APT Jazz is a slow-release root fertiliser for planted aquariums. It supplies ammoniacal nitrogen and other nutrients directly within the substrate to support stronger root-fed plant growth and rejuvenate mature aquasoil.

How deep should APT Jazz be placed?

Insert each capsule directly beneath the plant root zone at least approximately 2.5–3 cm / 1–1.2 inches deep.

How much APT Jazz should I use?

Use approximately 1 capsule per 2.5 square inches / 16 cm² of planted substrate area.

How often should APT Jazz be replaced?

APT Jazz is designed to provide slow-release root nutrition for approximately 2 months. Replenish after this period where continued root fertilisation is required.

Can APT Jazz rejuvenate old aquasoil?

Yes. Replenishing nutrients in mature or depleted aquasoil is one of APT Jazz’s primary applications.

Can APT Jazz be used with inert substrate?

Yes. For inert substrate, use a fine grain size below approximately 2 mm with at least 4 cm substrate depth. Aquasoil generally provides better nutrient retention around the root zone.

When should I expect results from APT Jazz?

Observe new growth from approximately 7 days onward. Existing older leaves will not rejuvenate, so evaluate newly produced leaves and subsequent plant growth.

What is the difference between APT Start and APT Jazz?

APT Start is designed primarily for initial aquarium setup and substrate enrichment. APT Jazz is designed to replenish root-zone nutrients later as established aquasoil or substrate becomes depleted.

Is APT Jazz suitable for red aquarium plants?

APT Jazz supports root-fed nutrition and can be incorporated into nitrate-limitation strategies used for suitable red plant species. Final colouration also depends on plant species, lighting, CO₂, overall nutrition and growing conditions.

Learn More About 2Hr Aquarist APT Jazz

For additional technical information and manufacturer guidance:

Official 2Hr Aquarist APT Jazz Product Information

Place capsule directly under the root zone of the plant you want to fertilize. Place at least 3cm /1.2″ deep.

Add 1 capsule per 2.5 inch2 / 16 cm2 bush of plant. Always siphon away stirred up detritus after replanting / adding APT Jazz.

Observe the impact in new leaves after 7 days. Root absorption takes longer than uptake through leaves. Old leaves do not rejuvenate.