My Betta has had a white spot pretty large size on top of his head for a couple of days now. He is eating and swimming fine. No change in behavior. Incidentally, I was at the end a week long cycle of Betta Fix treatment because he got beat up when we had to Evacuate our home due to wildfires. How can I tell if it’s a wound or fungus? There has also beenacoue of temperature spikes in water as I am adjusting a new heater for my small tank.