I recently purchased a betta from petsmart I have only had him for three days and late last night when I was going to bed I noticed he had some large white spots below his mouth.
When I woke up the growths had grown very quickly to other parts of his body and on his head. I went to the pet store and bought some API Fungal treatment and added it to his water immediately. It has been in his water for about 14 hours.
I did this after trying to research common diseases and it seemed to be a fungal disease. The growths are cottony and the one on his head floats above it and in several other places.
It seems he is doing better with the medicine he is moving around a little more but he is extremely lethargic and mostly sits or lays around in the various caves in the tank.
I have several important questions. should I change any of his water as im afraid this will cause more stress, and if so how much? also I want to try to make sure that I properly diagnosed him with the correct disease