Quick answer
Calcium supports calcification, while magnesium helps keep calcium and carbonate available. Maintain all three in balance using reliable salt mix and measured dosing.
What to check first
- Verify salinity first
- Test with reliable kits
- Track consumption over several days
- Check precipitation on heaters and pumps
Write down the test results, recent maintenance, new livestock, feeding changes and equipment faults. A short timeline prevents repeated guesses and makes patterns easier to see.
A practical action plan
- 1. Use water changes for modest correctionRecord what changes and retest before making another major adjustment.
- 2. Dose individual components from testsRecord what changes and retest before making another major adjustment.
- 3. Calibrate pumpsRecord what changes and retest before making another major adjustment.
- 4. Avoid simultaneous concentrated additionsRecord what changes and retest before making another major adjustment.
What to avoid
Do not dose magnesium or calcium because corals look unhappy without testing.
When it is urgent
Major chemistry errors should be corrected gradually.
How to prevent it next time
Use stable routines: quarantine additions, test before and after major changes, maintain backup aeration, keep equipment accessible, and record enough detail to compare today with the aquarium’s normal baseline. Prevention is usually cheaper and safer than emergency correction.
Research and review
This is original AquaNexus writing prepared for practical aquarium use. The husbandry framework was checked against authoritative veterinary, safety, scientific or specialist references.
Test rather than guess and make changes at a pace the livestock can tolerate. This guide does not replace aquatic veterinary advice. Follow product labels and local electrical-safety requirements.