PPS-Pro Dosing Method Guide: Precise Daily Planted Tank Fertilisation

Fertilisation can feel overwhelming when you first encounter the alphabet soup of NPK, micro-nutrients and competing dosing philosophies. The PPS-Pro dosing method for planted aquariums simplifies things with a practical premise: dose small amounts daily to maintain stable nutrient levels, avoiding the peaks and troughs of weekly dosing systems. This guide from Gensou Aquascaping at 5 Everton Park, Singapore, breaks down the method, the mixing recipes and the adjustments that make it work in tropical tanks.

What Is PPS-Pro?

PPS-Pro stands for Perpetual Preservation System — Professional. Developed by Edward, a prominent figure in the planted tank community, it aims to provide just enough nutrients each day to match plant uptake without excess accumulation. Unlike the Estimative Index (EI) method, which deliberately overdoses and relies on weekly water changes to reset, PPS-Pro targets precise daily replenishment. This means smaller water changes — typically 20–30 % weekly rather than the 50 % that EI demands.

The Two-Solution System

PPS-Pro uses two separate stock solutions dosed daily — one for macronutrients and one for micronutrients. Keeping them separate prevents chemical reactions that can lock out certain elements. Here are the standard recipes for one litre of each solution:

• Macro Solution: 14.3 g potassium nitrate (KNO3), 1.5 g monopotassium phosphate (KH2PO4), 29.4 g potassium sulphate (K2SO4) — dissolve in 1 litre of distilled or RO water
• Micro Solution: 32.5 g CSM+B (comprehensive supplement mix with boron) or equivalent trace mix, 29.4 g magnesium sulphate (MgSO4·7H2O, Epsom salt) — dissolve in 1 litre of distilled or RO water

Dry fertiliser salts are available from specialist aquarium suppliers on Shopee and Lazada, typically for $5–$15 per compound. A single batch of stock solution lasts months.

Daily Dosing Schedule

The standard dose is 1 ml of each solution per 40 litres of tank water, added daily. For a 120-litre planted tank, that means 3 ml of macro solution and 3 ml of micro solution each day. Dose in the morning, shortly after lights come on and CO2 begins flowing, so plants can immediately utilise the nutrients.

Use graduated syringes or dosing pumps for accuracy. Eyeballing with a teaspoon leads to inconsistency — and consistency is the entire philosophy behind PPS-Pro.

Advantages Over Other Methods

The daily dosing approach maintains remarkably stable nutrient levels throughout the week. Plants receive a steady supply rather than a Monday feast followed by a Friday famine. This stability reduces algae triggers, since nutrient swings — particularly with nitrate and phosphate — are a well-documented contributor to algae outbreaks.

Smaller water changes are another practical benefit, especially in Singapore where water costs add up for hobbyists running multiple tanks. PPS-Pro also tends to produce slightly leaner conditions, which can enhance red colouration in demanding species like Rotala and Ludwigia.

Adjustments for Tropical Conditions

Singapore’s warm water temperatures (26–30 °C) increase plant metabolic rates compared to temperate setups. You may find that the standard PPS-Pro doses fall slightly short in heavily planted, CO2-injected tanks running at 28 °C or above. Watch for pale new growth (nitrogen deficiency), pinholes in older leaves (potassium), or stunted tips (calcium or micronutrient shortfall).

Increase dosing by 25–50 % if deficiency symptoms appear, and assess results over two weeks before adjusting further. PUB tap water contributes minimal nutrients after dechlorination, so your dosing regimen is essentially the sole nutrient source for plants.

When PPS-Pro May Not Be Enough

Extremely high-light, high-CO2 tanks with demanding carpeting plants like Hemianthus callitrichoides or dense stem forests may consume nutrients faster than standard PPS-Pro delivers. In these scenarios, a hybrid approach works well: PPS-Pro as the daily base, with supplemental iron or potassium dosed on alternate days based on testing. Some hobbyists eventually transition to full EI dosing for maximum-demand setups.

Conversely, low-tech tanks without CO2 injection need considerably less. Halve the standard dose and monitor for algae — in slow-growth setups, even modest excess nutrients feed algae before plants can use them.

Testing and Monitoring

One critique of PPS-Pro is that it works best when you test water parameters regularly. Invest in reliable liquid test kits (API or NT Labs) for nitrate, phosphate, iron and potassium. Test weekly for the first month to calibrate your dosing to your specific tank’s consumption rate. Once stable, monthly testing is sufficient for maintenance.

A Balanced Approach

PPS-Pro occupies a sensible middle ground between the laissez-faire approach of occasional dosing and the brute-force philosophy of Estimative Index. It suits disciplined hobbyists who enjoy daily interaction with their tanks and prefer precision over excess. For help setting up a fertilisation programme tailored to your planted aquarium, the team at Gensou Aquascaping is happy to advise.

Related Reading

• How to Set Up Auto Dosing for Your Planted Aquarium
• EI Dosing Complete Guide: Estimative Index for Planted Tanks
• Glutaraldehyde in Aquariums: Liquid Carbon and Algae Control
• Iron Dosing in Planted Aquariums: Red Plants Need It Most
• Lean Dosing Method for Planted Aquariums: Less Is More