Three useful phases
| Tank phase | Starting cadence | Measure first | Why it changes |
|---|---|---|---|
| Fishless cycle / new biofilter | Ammonia and nitrite daily or whenever an input changes; nitrate every few days | Ammonia, nitrite, nitrate, pH | You are watching a moving process, so sparse snapshots can miss the transition |
| Newly stocked system | Ammonia and nitrite after additions; nitrate and alkalinity weekly | Ammonia, nitrite, nitrate, alkalinity | Bioload, saltwater changes and early maintenance are still settling |
| Established mixed reef | Salinity and temperature at each maintenance; alkalinity weekly or more often when dosing; calcium, magnesium, nitrate and phosphate weekly to fortnightly | Alkalinity, calcium, nitrate, phosphate | Consumption and nutrient export—not the calendar alone—set the useful frequency |
Make the result comparable
Test at a similar time, before or after maintenance in the same way, and rinse vials with the sample where the instructions allow. Record the exact result, units, kit and date. If you change salt, dosing, feeding and filtration at once, you lose the ability to learn which change mattered.
When to increase frequency
- You start or change a dosing pump.
- New coral, fish or a large clean-up crew changes demand.
- Alkalinity, nitrate or phosphate moves faster than your normal trend.
- A water change, equipment fault or contamination event may have altered the system.
When not to overreact
A single result can be wrong, mistimed or outside the method’s useful resolution. Repeat a surprising reading with clean equipment, check the reagent expiry and compare it with salinity and recent maintenance notes. Stability is usually a better objective than forcing a number back to an internet “ideal”.
Sources and limitations
Red Sea’s Marine Care documentation lists ammonia, nitrate, nitrite, pH and KH as separate tests with different ranges and test counts; that is why a new tank and a mature dosing system need different toolkits. This page does not prescribe livestock targets or replace manufacturer instructions.