Water
A simple water-testing routine
Test the water you cannot judge by looking at it. Keep the results, dates and units together.
The useful starting set
Measure ammonia, nitrite, nitrate, pH, KH and temperature with kits intended for freshwater fishkeeping. Where oxygen may be limited, discuss dissolved-oxygen measurement too. Keep the kit in date and follow its timing and sample instructions.
Make readings comparable
Use clean sample containers, the correct reagent amounts and the chart for that exact kit. Do not mix mg/L ammonia-nitrogen with differently labelled units. Record what the kit actually measures.
Look for trends
Log feeding changes, new fish, filter work, medication and unusual weather alongside the numbers. Take extra readings after changes rather than waiting for a regular testing day.
If something is wrong
A zero result for one parameter does not clear the whole pond. Recheck an unexpected result, assess the fish, and ask for help with the complete set of readings. Do not add more fish while a water-quality problem is unresolved.
Start a useful record
Label each result with the test kit, units, sample time and any recent water change. Use the water journal linked below to keep observations beside the numbers and export a copy for a professional.
Sources & further reading
Original WakeyKoi wording, informed by the references below. Linked clinical resources explain the evidence and their scope; they have not reviewed or endorsed this website.
Related guides
Educational guidance cannot diagnose an individual fish. Breathing distress, severe injury or unexplained losses need prompt professional assessment.