size of tank 1 gallon
temp of tank 75
does your tank have a filter no
is your tank heated no
no tank mates
i feed 1 piece of frozen brine shrimp and 3 to 4 tetra betta pellets
twice weekly water changes of 25 percent
i add water conditioner to the tank every water change
i dont have a test kit
i just got him about 2 weeks ago and i remember he already had a little dip in his tail
dont know much about his behavior
lots more rips in his fins
i treated him for a week with betta revive then did a 100 percent water change and im giving it 2 weeks before i treat again
no history of being ill
i have only had him for 2 weeks so i have no idea how old he is
In a one gallon bowl, it is recommended you do 1 100% change and one 50% change a week to keep ammonia levels down. Some members will say every other day or daily as recommended maintenance. For now I recommend doing daily 100% changes to help clean up any trouble.
Does he tail look like it's getting smaller or shrinking? Is the edge black or appear to have any blood on it? It is possible he could have fin rot, or possibly biting his tail. Are there any decorations that might have caused tears in his fins?
I don't see any black on his fins, so would think tail biting. More plants or a small cave of sorts would be welcomed. Also daily mirror exercises, 3 mins or so at a time, 1-2 times a day will keep him on his toes.
Silverfang is right about the amount of water changes per week. Would also add in stress coat if you have it to help promote fin growth. Do the daily water changes for a week to 10 days and see if it helps any. Good luck, he's a cutie =)