Ok, here we go.
What size is your tank? Was in a 3 gal when symptome appeared, currently in a 1 gal bowl for treatment.
What temperature is your tank? 80-82 degrees
Does your tank have a filter? The tank: Yes. The bowl: No.
Does your tank have an air stone or other type of aeration? No
Is your tank heated? No
What tank mates does your betta fish live with? None
What type of food do you feed your betta fish? Was feeding frozen bloodworms. Now he's eating Hikari pellets.
How often do you feed your betta fish? Once a day, except on wednesdays, 2-3 pellets.
How often do you perform a water change? Change bowl water once every day or two.
What percentage of the water do you change when you perform a water change? 100%
What type of additives do you add to the water when you perform a water change? Was using untreated spring water, have switched to treated tap.
Have you tested your water? If so, what are the following parameters?
Symptoms and Treatment
How has your betta fish's appearance changed? Black edge to his tail. He's starting to look like a crowntail, tail disappearing.
How has your betta fish's behavior changed? None.
When did you start noticing the symptoms? 1 month ago.
Have you started treating your fish? If so, how? Moved him to a smaller bowl. Salt baths every few days. Water changes.
Does your fish have any history of being ill? Has mild swim bladder disorder, but it doesn't affect him much.
How old is your fish (approximately)? Got him from Petco maybe 3 months ago. A year perhaps?
So I was keeping Two-Tails in a 3 gal M-NPT (Micro natural planted tank) when I noticed his tail was shrinking. Since I was then having a problem in the tank with cyanobacteria/blue-green algae, I decided to put him in a smaller bowl where I could more closely monitor him and change his water easier. I've also switched him to pellets instead of bloodworms to keep his water cleaner. It's been a month now. His tail is still shrinking, but only barely, but I can't get the black stuff at the edges of his tail to go away. I want to move him into a new tank I got (5 gal NPT) and out of that tiny bowl, but I don't want the fin rot to start advancing again.
I don't want to have to start medicating him (BettaRevive or Bettafix) because that has never gone well for me in the past. :(
Any suggestions? Any at all? I'll try anything.