One of my young Geophagus is looking sick. Looked fine yesterday but this morning, is not very active, fast breathing and has a white thing on its side.
As you can probably see in photos I have added some wunder tonic that I had handy. But if anyone can help Id the issue so I can do a more targeted treatment that would be great.
PH 6.8-7
GH and kh 30-40 ppm
Ammonia 0
Nitrite 0
Nitrate 5 ppm
Water conditions have been consistent and no other fish in the tank have any sign's of sickness.