Salinity swings stress everything
In reef tanks, evaporation removes water—but leaves salt behind. That means salinity creeps up unless you top off consistently. Small daily swings can stress corals, irritate fish, and make chemistry feel “random.”
The simple rule
Top off with fresh water (not saltwater) to replace evaporation.
How to keep salinity stable
- Check salinity on a schedule
- Top off at the same time daily (or use an ATO)
- Avoid “big catch-up” top-offs
Why stability beats perfection
Corals handle slightly imperfect numbers better than constant swings.
Support products
Conditioners can help when you’re mixing water, doing changes, or correcting issues carefully.
Browse: Aquarium Chems, Bacters & Cultures.
Adventure Gear (mixing + transport)
Having containers and a simple kit helps with water mixing, emergencies, and livestock moves.
Browse: Pet Adventure Gear.
CTA
Want a calmer reef? Start with salinity stability and build from there: Shop Reef Tank Supplies.
