Tetra pH/KH minus

Lowers pH and KH in a controlled manner — ideal for soft water fish

Especially for discus, apistogrammas, and other Amazonian species — freshwater and saltwater

✅ Level: Intermediate — Monitor water parameters during use. Adjust gradually for safety.

Tetra pH/KH minus is a precise water preparation agent for the controlled lowering of pH and KH values. Excessively high pH or KH can negatively affect the health of fish and plants. With Tetra pH/KH minus, you can safely and gradually bring the water parameters to the desired level. Particularly suitable for soft water fish such as discus and apistogrammas.

🔧 Product Specifications

🚚 Delivery & Warranty

• Fast delivery from our store — ready to use immediately
• Shipping Tuesday or Friday → Read more about shipping
• Delivery with track & trace, usually within 1–2 business days
• Problem with your order? We will resolve it together. Please contact our customer service.
• Free shipping from €59,-

✂️ Usage Tips

Always adjust pH gradually — no more than 0.5 pH per day. Monitor pH and KH with a test kit before and after treatment. Combine with Tetra ToruMin for an authentic blackwater environment for Amazonian fish.

💡 Tip

Use pH/KH minus in combination with Tetra ToruMin for a complete blackwater setup for discus or apistogrammas — the peat extracts in ToruMin naturally lower the pH, while pH/KH minus provides additional control.

❓ Frequently Asked Questions

How quickly can I lower the pH?
Never adjust the pH by more than 0.5 per day. Rapid pH changes cause stress and can kill fish.

What is the ideal pH for discus?
Discus thrive best at a pH of 6.0–7.0 and a KH of 1–4 dH.

Do you have another question? Feel free to contact us — we are happy to help you make the right choice for your aquarium.