The Planted Tank Forum - View Single Post - What disease is this? Need help!
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post #6 of (permalink) Old 06-30-2020, 03:04 AM
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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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