Got questions about aquarium water chemistry? This FAQ answers what freshwater and reef aquarists ask most — clearly and without jargon — and points you to a free app that handles the hard parts.
Quick How-To
- Start simple. Enter your basics once so everything is tailored to you.
- Log consistently. A few taps each time is all it takes.
- Act on the numbers. Let the app tell you the next step.
- Review and adjust. Use the trends to improve over time.
Frequently Asked Questions
What parameters should I test?
At least pH, ammonia, nitrite and nitrate; reef tanks also need KH, calcium and magnesium.
Why is my tank cloudy?
Often a bacterial bloom in a new tank or overfeeding — test and reduce feeding.
How often should I change water?
Typically 10–25% weekly, adjusted to your bioload.
What causes algae?
Excess nutrients and light — reduce both and stay consistent.
Does it work offline?
Yes — logging and calculators work without a signal.
Is the app free?
Yes — logging and calculators are free, with an optional ad-free Pro upgrade.
What the Free App Does For You
Aquarium Chemistry Pro brings it all together:
- Parameter logging (pH, ammonia, nitrite, nitrate, KH, GH, salinity)
- Dosing calculators for common additives
- Target ranges with status indicators
- Multiple tank profiles
- Water-change calculator
- Trend charts to catch problems early
…and more — all offline, private, and free with an optional ad-free Pro upgrade.