Write down the test details
Record parameter, result, unit, kit or meter, and date. Without units, the same number can mean different things.
For digital meters, note calibration when relevant. A reading is only as useful as the instrument and method behind it.
Connect readings with events
Note water changes, filter service, new livestock, and major temperature shifts. These events may provide context for a breeding pattern.
Do not assume that an event caused a result just because it happened nearby in time.
Use the record cautiously
Compare conditions across periods when the colony was active or quiet. A log can guide investigation, but it cannot establish a controlled experiment.
Seek expert input for persistent concerns and share the measurement method along with the numbers.
Use these as general hobby references. Test your aquarium and confirm product guidance before making changes.