Alright so first off,
What size is your tank? 10 gal
What temperature is your tank? 78 degrees F
Does your tank have a filter? Yes
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? Pellets
How often do you feed your betta fish? Once or twice a day, 4-5 pellets per day.
How often do you perform a water change? Twice a week.
What percentage of the water do you change when you perform a water change? 50% one day, 50% with gravel vac the other.
What type of additives do you add to the water when you perform a water change? Slime coat +
Have you tested your water? If so, what are the following parameters?
Symptoms and Treatment
How has your betta fish's appearance changed? Ragged tail and dorsal fins.
How has your betta fish's behavior changed? None.
When did you start noticing the symptoms? A week ago.
Have you started treating your fish? If so, how? No.
Does your fish have any history of being ill? No.
How old is your fish (approximately)? I got him in October.
I got my betta Arejay while I was at school in October. While there he was in an unfiltered, heated, 2 gallon tank which I did 100% water changes to weekly. While there he had zero issues and was healthy as could be, his fins were beautiful and unmarred.
When I moved back home for break I brought him and put him into the 10 gallon described above. He was doing fantastic, until one day I checked up on him and noticed that his tail was jagged, like big chunks were taken out of it. This was sudden, the night before his fins had been fine. I kept an eye on him, and a few days later the same thing had happened to his dorsal fin.
I don't think it's rot, since it was extremely sudden, but I'm wondering, is he actually biting his tail? He has the same decorations he did in the 2 gallon, the only added thing is a live anubias plant, betta leaf, and moss ball.(None of which I think would injure him.) The other new addition is the filter. I have put aquarium sponge into the intake to cut down on the pull, but is it possible he got sucked in there? I keep checking on him, and his dorsal is healing very nicely, but his tail seems to heal a little, then suddenly go back to the tears and chunks missing. Any input is greatly appreciated, and maybe some tips to help the healing process along? Thanks! Here's a before and after picture