u/Accomplished-Arm1175

I need help trying to figure out what this is he is 2 years old never had this happen before but i noticed it 2 days ago after he ate about 7 small goldfish im gonna stop feeding live bait all together but the water parameters are fine and i did a 25% water change he is eating like normal and his behavior is normal i just want to make sure i do wat i can to help him so he lives as long as possible i will try an epsom salt bath and maybe melafix bc i seen people on other forums say they tried those and they may work but i dont want to stress him out he is pretty big about a foot long and i am planning on getting a bigger tank for him