The clown has been in a quarantine tank for 4 weeks now. She was treated for itch with copper. The itch has been gone for two weeks. Copper levels are zero. Unfortunately, setting up a QT was an emergency, so it is still cycling. Ammonia 0, nitrite 2, nitrate 10.
I noticed the spot today. It is purple in colour and is raised above the skin level. The tank is bare, except for a submarine toy. The fish is very active, opens its mouth rapidly. There is another little clown, he seems ok.
I have been doing 25% water changes every second day to reduce the stress of bad water. The tank is small, only 40 litters (a QT).
Grateful for your advice.
