Planted Tank Guru
Join Date: Dec 2017
Location: Elk Grove, California
I am thinking water quality is the issue- especially since you did a 50% water change 2 days ago and still have a nitrate reading of 60 ppm.
It is typical of Old tank syndrome to have increasing acidification in the aquarium. The lower pH makes sense.
Do you typically do 50% water changes? Have you done this size water change before (recently) and not had any issues afterward. It can be a problem if a tank is suffering from old tank syndrome to do too large of a water change because of the difference between the pH of the tank and the tap.
Im also concerned the fish may be dealing with velvet as a consequence. It thrives in tanks with low pH and high organics. It is difficult to see but one way you can see it is to turn out the lights and shine a flashlight on the fish. It has the appearance of a velvety film on the skin that resembles gold or rust colored dust.
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