Hello! I noticed that my betta has white cotton stuff around him and found out that it was fungal infection. I don't know what to do and how I could help my lil guy. He's been laying on his side for two days :( I ordered medicine on Amazon but it won't come until tomorrow. What could I do to...

I lost Bigfin about 10 days ago. I had him just a year. I used to do everything wrong (small bowl, no heat, 1/month water changes) and had them living longer than that! NOW - I thought I was doing it right for Bigfin. I did a lot of research here before getting him. I have a 3 gallon tank...