EI Dosing vs PPS-Pro vs Lean Dosing

As a hobbyist of planted aquariums, you need to pay closer attention to nutrient management. Most of them consider CO2 and lighting the main factors in algae control, plant growth, and long-term tank stability. However, fertilizer dosing also plays the same important role. 

Here, the real challenge is the different aquariums. And no single fertilization method works well for all of them. Some aquarists look for plants that need lower maintenance and grow faster without regular water changes. That’s why they are adopting three popular dosing methods: 

• Estimative Index (EI)

• PPS-Pro

• Lean Dosing.

Each method has its own philosophy. EI provides maximum nutrients, PPS-Pro focuses on meeting nutrient needs, and Lean Dosing limits nutrient availability. 

How Does EI Dosing Work?

The Estimative Index is a fertilization method that provides aquarium plants with the nutrients they are likely to use. 

EI doesn't calculate exactly how much phosphorus, nitrogen, potassium, and other nutrients the plants need every day. Instead, it adds maximum nutrients throughout the week. 

Hobbyists change water, typically around 50% once a week. It prevent nutrient levels from building up indefinitely. It even resets nutrient levels before the next dosing cycle begins. The approach depends on the belief that it is very difficult to accurately measure much of the nutrients that plants actually consume in the aquarium. 

Nutrient uptake can vary depending on factors such as plant species, CO2 levels, and overall tank conditions. EI helps prevent nutrient deficiency, the main cause of poor plant growth.

Does EI Dosing Cause Algal Growth?

Many aquarists think that adding large amounts of nutrients will cause algae growth. However, the EI method relies on the idea that a larger amount of nutrients alone is not the primary cause of algal growth. According to the EI philosophy, algae appear when plants are unhealthy or unable to grow properly. A healthy, fast-growing plant mass can outcompete algae for nutrients, light, and space. You need to grow strong, healthy plants, as they are the best natural defense against algae. 

EI ensures nutrients are always available, and their unavailability does not become a factor that limits plant growth. Instead, plants grow with more strength and compete with algae. If algae problems occur, they are usually linked to other issues. 

What Are the Nutrient Levels in EI Dosing?

A standard EI dosing schedule can provide the following nutrients in a week: 

• Nitrate (NO₃): 20-30 ppm

• Phosphate (PO₄): 5-7 ppm

• Potassium (K): 20-30 ppm

• Iron and trace elements: 0.5-1 ppm

These nutrient levels are higher than those from the other dosing methods. However, the goal is to keep nutrients available to plants the entire week. Such stability supports healthy growth and even prevents nutrient shortages that can slow plant development. 

Make sure nutrient levels remain stable between water changes and other factors so EI dosing works effectively.

Who Should Use Estimative Index (EI) Dosing?

EI dosing is not the best choice for every planted aquarium. As it provides nutrients that promote quick plant growth, it works best in tanks where plants can actively use those nutrients. You need to consider EI dosing for:  

• Heavily planted aquariums (>70% of substrate planted)

• Plants that need more nutrients.

• Faster-growing plants

• A new aquascape or time-sensitive project. 

• Good aquarium maintenance habits.

How To Dose PPS-Pro In Planted Aquariums?

PPS-Pro is designed for planted aquariums using CO2 injections and a moderate fish load. These provide plants with the nutrients they need through small, continuous daily doses. 

The main idea behind PPS-Pro is to add nutrients at a rate that closely matches the plants' daily use. Instead of adding a huge amount of fertilizer all at once, the method can provide balanced doses of both: 

• Macronutrients (such as phosphorus, nitrogen, and potassium)

• Micronutrients (such as iron and trace elements)

It helps plants grow while reducing the risk of nutrient deficiencies. Most hobbyists prefer PPS-Pro because it maintains stable nutrient levels in the aquarium. It can help support healthy plant growth and reduce the risk of algal problems by avoiding both nutrient shortages and excessive nutrient levels. 

PPS-Pro does not rely on regular water testing or large water changes. Instead, some of the aquarists use TDS (Total Dissolved Solids) measurements. It is a simple way to check if nutrients are building up in the aquarium over time. Due to its balanced, practical approach, PPS-Pro is chosen by aquascapers seeking healthy plant growth with lower maintenance.

How Does PPS-Pro Dosing Work?

PPS-Pro is designed to provide your aquarium plants with a regular supply of nutrients every day. You need to add the recommended doses once daily for the best results. However, do it before you turn on the aquarium lights. The dosage will depend on the tank size and lighting level. 

What is Lean Dosing In A Planted Aquarium?

Lean dosing is a fertilization method that provides aquarium plants with only the nutrients they need for healthy growth. There is no need to leave a large amount of excess nutrients in the water. The goal is to supply nutrients in a small, controlled amount that plants can use completely between doses. 

The approach differs from the Estimated Index method, which internally adds nutrients in greater amounts to ensure plants don't run short. As EI dosing leaves extra nutrients in the water, regular large water changes are needed to reset nutrient levels and prevent buildup. 

Lean dosing keeps nutrient levels much lower and closer to the actual plant demand. It can help maintain a cleaner nutrient balance and reduce the risk of nutrient buildup over time.

What Are the Different Nutrient Targets?

Who Should Use Lean Dosing?

Lean dosing is best suited for low- to medium-light planted aquariums where plants grow steadily and not extremely fast. These tanks usually run with moderate lighting, and there is either no CO2 injection or only a moderate amount of CO2. 

It works well for aquariums with slow-growing and low-maintenance plants such as Java Fern, Anubias, Cryptocoryne, Bucephalandra, and various aquarium mosses. As these plants have lower demand for nutrients, they can grow without higher nutrient levels. Lean doses reduce nutrient buildup in the water. 

Nutrients are usually added in smaller amounts and are largely consumed by plants. As a result, aquarists usually maintain healthy tanks with smaller weekly water changes of around 20-30% instead of 50%. It makes lean dosing a preferable option for hobbyists who want a simple, low-maintenance aquarium routine.

So, Which Dosing Method Should You Choose?

It's not about choosing the dosing method according to its popularity. Instead, you need to consider your aquarium's needs. A heavily planted, high-light aquascape can thrive with EI. However, a low-tech community tank performs better with lean dosing. PPS-Pro is the preferred choice for those who need a balance between both. 

The successful planted tanks are not the ones that get the most fertilizer. They are the ones that have all: CO2, lighting, nutrients, and maintenance.