Aquarium Water Parameters Guide: Testing, Meaning & Stability
Understand aquarium pH, GH, KH, ammonia, nitrite, nitrate and temperature, with a table that keeps species-specific requirements in context.
Plan, understand and improve your aquarium.
Plan your setup, understand everyday problems, and keep your aquarium’s care, water readings and progress together. Explore the free tools, databases and lessons at your own pace.
Start here
What do you want to do?
Your aquarium, from setup to everyday care.
Start with your setup and plants. Record care and water readings, then use your history to see what changed.
Your free account — Up to 2 active or paused aquariums, with setup details, care planning, water readings and logs.
Explore My AquariumsReal aquariums. Real inspiration.
Discover aquariums shared by our community and follow their progress.
AquariumLesson in numbers
- 700+
- Aquarium Plants
- 800+
- Fish Species
- 15+
- Algae Profiles
- 110+
- Lessons
Practical guides for aquarium setup, care and troubleshooting.
Start with focused lessons before you change lighting, layout, planting or long-term care.
Aquarium Water Parameters Guide: Testing, Meaning & Stability
Understand aquarium pH, GH, KH, ammonia, nitrite, nitrate and temperature, with a table that keeps species-specific requirements in context.
Calculate lighting, dosing and aquarium volume
Use practical calculators before changing lighting, nutrients, substrate, volume or CO₂.
Open calculatorsAquarium inspiration from @AquariumLesson
Aquascapes, fish, plants and practical ideas from AquariumLesson.