What is KH in aquariums?
KH (Carbonate Hardness) represents the buffering capacity of water, helping resist sudden pH changes.
Why KH is important
Low KH can cause dangerous pH swings, while high KH stabilizes alkaline environments.
Typical KH ranges
- Soft water tanks: 0–3 dKH
- Community tanks: 3–6 dKH
- African cichlids / marine: 7–12+ dKH
What affects KH
- Tap water composition
- Crushed coral or limestone
- Water changes
- Biological activity
KH directly influences pH stability and should be monitored regularly.