Flashing or rubbing
Often linked to irritation from parasites or water quality. First check ammonia, nitrite, pH, temperature, and recent chemical changes.
Gasping or hanging near waterfalls
Can indicate low oxygen, gill irritation, parasites, medication stress, or poor water. Increase aeration immediately while checking water.
White spots
Salt-like spots may suggest Ich, but visual confirmation matters. Treatment timing can depend on water temperature and the parasite life cycle.
Ulcers, redness, or open wounds
Often need cleaner water, isolation, and professional assessment. Bacterial problems can progress quickly and may require targeted care.
Clamped fins, isolation, lethargy
General stress signs. Compare behavior across the whole pond and do not medicate blindly if all fish changed after a water event.