Compare water, behaviour, size and feeding—not colour alone.
Understand the whole system first
Compare water, behaviour, size and feeding—not colour alone. Good care starts by observing the whole system, rather than chasing one number or a quick product fix.
Make one change at a time
Stability matters to fish and beneficial bacteria. Avoid large simultaneous changes to water, light, feeding and equipment.
Keep notes and watch the response
Record test results, water changes and animal behaviour. The pattern becomes more useful than any isolated reading.
Keep in mind
If behaviour changes suddenly or water tests enter an unsafe range, pause new additions and ask an experienced aquarist for help.