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Joseph
The problem is this... The fox has been in the aquarium for about 3 months. It eats and looks good... Recently, I noticed strange behavior - it starts swimming from one corner of the tank to another, as if something scared it or it can't breathe. At first, I didn't pay much attention, but yesterday it swam like that all day! This morning, the fish was just a fish... swimming, eating... But after 2-3 hours of the lights being on, it started darting around again. It doesn't bump into the rocks or try to break the tank with its head, but the behavior is clearly not good. I don't see any parasites or signs of other ailments. Following advice from a book and Savchuk, I made fresh baths. I filled 3 liters of osmosis water, adjusted the pH to 8 with baking soda, and matched the temperature to that of the aquarium. After that, the fish huddled in a corner and stayed there for 2 hours. Now it's darting around again... The other fish seem to be doing well. The main water parameters are normal! What could this be? Should I put it in a quarantine tank for about 3 weeks and treat it with copper sulfate? Changes in the aquarium over the past 2 weeks: I installed a DI unit for the osmosis system and switched to Tropic Marin salt (previously used Red Sea).