I unfortunately do not have a photo now of my Betta, but he has had a large open-looking fungal infection(?) on his mid-back. It is currently about 1/4 the size of your average thumb nail. There have been pink lines/spots (I think it's his tissue) that have come and gone, but it mostly looks like white fuzz. He has been in a hospital tank that is about 1.5 gal on and off for a few months. This is his third round in the hospital tank. I was treating him daily with Pimafix which cleared it up quickly the first two times. I've since added Melafix for about a week now- he seems more active, but he infection doesn't look any better. This time he has been in the hospital tank for about two and half weeks with little improvement.I went to one of the local aquarium stores (the mom and pop kind, not the commercial kind where the advice is always a bit "ify")- they told me to change all of the gravel out, which I did (in both the original tank and in his hospital tank.I also added in the appropriate amount of salt for each tank (both are odd shapes, the original one which is currently uninhabited until I figure out what is going on...Preceding all of this I had everything but my Betta die in the original tank. I found out later that our county was flushing out and treating all of the water lines in the area, so although I treated all of the water and let it sit, I probably should have let it sit for an extra day or two with the added chemicals.For my regular water change schedule, I usually do about a 10% change once a week unless there is a reason to do more.For the water change schedule in my hospital tank I've been following the directions for the anti fungal/bacterial treatments and doing a 25% water change every week.My main tank has two small short sword plants in it- it used to be more heavily planted, but some of the plants did not appreciate the salt I put in it (the label did warn that may happen for some...it's another reason I have left the tank empty for now)My hospital tank has two small live plants in it (I don't remember what they are called) they are rather hardy and don't mind any of the salt or the treatments used so far. All of the directions told me to take the carbon filter out, so my filter is just running with a foam block for now...I added the plants in to help with the oxygen level...and my betta loves to sleep on them like a hammock, he was pretty lethargic until I put some back in.I also have a small heater to keep the tank warm.I've looked into getting antibiotics, but I don't know which ones to use, the ones I found were very expensive, and I am very allergic to them (amoxicillin)- if I get a tiny bit on myself I break out in hives...and the directions on using them are very mixed. I am willing to use them (I'll just put a full smock on or something)...but what I don't want to do is spend just shy of $50 on a medicine that Dr. Google said would do the trick, to find out that I didn't do the proper research and should have purchased something else instead.