It sounds like your pond water has high pH
How to be sure
Your test results show alkaline or high pH levels (above 8.4) and your pond generally looks ok – this is an invisible water quality problem. Your fish won’t like it – they may appear pale or dark and shimmy, scratch, jump and flick against objects in the pond.
Step 1 – Treat your pond
- Treat the entire pond using pH Adjuster for Alkaline Ponds.
- Complete a 10% water change if the pH is particularly high and re-test
Changes in pH should always be made gradually. Never change the pH value by more than 0.5 in any one day.