My betta Hrothgar's fins look very frayed along the edges, and I can't figure out what what's causing it. At first I thought he was biting his tail, but it doesn't quite look like pictures I've seen of that. I thought his decorations weren't rough enough to cause any fin damage, but maybe not? There's no sign of fin rot, but I've got him in aquarium salt to prevent infection. I would appreciate some other opinions!
What size is your tank? 1 gallon
What temperature is your tank? 79 Farenheit
Does your tank have a filter? no
Does your tank have an air stone or other type of aeration? no
Is your tank heated? yes
What tank mates does your betta fish live with? none
What type of food do you feed your betta fish? New Life Spectrum Betta formula
How often do you feed your betta fish? 5ish pellets, once a day
How often do you perform a water change? every 3-4 days
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? Top Fin water conditioner
Have you tested your water? If so, what are the following parameters? N/A
Symptoms and Treatment
How has your betta fish's appearance changed? Fins look frayed around the edges, the red on his fins has gotten a little bit paler
How has your betta fish's behavior changed? He seems very restless. Moving his gravel around, trying to get under it
When did you start noticing the symptoms? about a week and a half ago
Have you started treating your fish? If so, how? I've done 2tsp/gal of aquarium salt for a few days.
Does your fish have any history of being ill? He had mild swim bladder disease when I got him, but it cleared up right away. Nothing since.
How old is your fish (approximately)? I've had him for about 2 months.
When I got him: