2HR Aquarist · All-in-one liquid
APT3
CO2-injected planted tanks with an average fish load that want one simple fertiliser.
1 model
2HR Aquarist · All-in-one liquid
2HR Aquarist APTe (APT EI)
A ready-mixed take on the Estimative Index method: generous, non-limiting doses of every nutrient, reset by a big weekly water change. It gives you the EI approach without weighing out dry salts.
Updated
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Best for
Fast-growing, high-light CO2 tanks where you do a large water change every week.
Worth knowing
EI relies on weekly water changes of about half the tank to stop nutrients building up, so it is not for low-tech tanks.
What stands out
- Based on the Estimative Index dosing method
- Generous, non-limiting nutrient levels
- No dry salts to weigh or mix
Specs
- Brand
- 2HR Aquarist
- Supplies
- Macro, micro and trace at EI levels
- Adds nitrate and phosphate
- Yes, generously
- Effect on KH and pH
- None
- Form
- Liquid
- How often
- Daily, with a large weekly water change
- Suits
- High-light CO2 tanks
- Sizes
- Standard, 200 ml, 500 ml, 1000 ml
Figures from the maker's published specifications. Makers revise products, so check the current figures before buying. Photos supplied by the brand or its distributor.
Compare with
Browse all fertilisers & treatments
2HR Aquarist · Starter and bacteria
APT Balance
New aquasoil tanks during cycling, or after a big rescape or filter clean.
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2HR Aquarist · Foliar spray
APT Dew
The dry-start phase of a carpet, and emersed mosses and plants above the waterline.
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2HR Aquarist · Nutrient aquasoil
APT Feast
New planted tanks and soft-water shrimp setups that want a feeding substrate from day one.
1 model
Frequently asked questions
Quick answers about the 2HR Aquarist APTe (APT EI), drawn from its specs.
Who is the 2HR Aquarist APTe (APT EI) best for?
Fast-growing, high-light CO2 tanks where you do a large water change every week.
Is there anything to watch out for with the 2HR Aquarist APTe (APT EI)?
EI relies on weekly water changes of about half the tank to stop nutrients building up, so it is not for low-tech tanks.
What are the alternatives to the 2HR Aquarist APTe (APT EI)?
Other fertilisers & treatments worth comparing: 2HR Aquarist APT3, 2HR Aquarist APT Balance, 2HR Aquarist APT Dew. Add any of them to the compare table to see the specs side by side.
How do I compare the 2HR Aquarist APTe (APT EI) with similar products?
Tap Compare on this page and on any other fertiliser or treatment you are considering, then open the compare table. It lines up every published spec side by side and lets you pick the size of each product.