Home
Guides
Reef chemistry guides
Plain-language, sourced guides — the why behind your numbers, and what to actually do about them.
Start here
Why is my alkalinity dropping?
And why your calcium can look stable while it does.
Reference
Ideal reef tank parameters
The sourced target ranges for every key parameter.
How to raise alkalinity
Baking soda or soda ash, and the safe limit.
How to raise calcium
How much — and why it's usually not the problem.
How to raise magnesium
How much, and why it comes first.
How to lower alkalinity
Bring it down safely — usually by not chasing it.
How often should you test?
Test for the trend, not the number.
Are zero nitrates and phosphates bad?
Why zero isn't clean — the dino risk.
Reading up because a number's off? Reef Stability watches your alkalinity, calcium and magnesium for you — and tells you what to change, or when to leave it alone.
Coming soon to the App Store