Hoping someone may have seen this before and know how to help us. Levi has developed a huge lump in his tail - its been growing steadily for maybe 2 - 3 weeks and is now right up against his body.
His water is cleaned weekly and the gravel gets stirred up and cleaned at least once a month. He's eating normally and it doesn't seem to bother him but its bothering me! He's about 3 so not a young fish.
All our other fighters are treated the same with the same water (but in different aquariums) and none of the others are showing any signs of the same thing so I don't think its anything that has come in through the water.
Will post a pic. I took him to the local aquarium store today but they had never seen anything like it before so couldn't tell me anything other than give him a salt bath and maybe prick it. I don't want to do that and stress him out or worse - make it worse!