Lump on Cherry Barb

[FallenAngel]

Hello, i purchased five cherry barbs about 3-4 months ago for my 30 gallon tank. One of them has always appeared "rounder" than the others i guess you could say, but here recently i noticed she seemed noticibly larger on one side in particular. The lump also has a small gray dot towards the bottom. Any ideas on how to treat her or what it is? Could it be a tumor or swim bladder issue? None of the other fish have any illnesses and the cherry barbs where the last fish i have introduced. Ill add some pictures for clearer diagnosis. She is also swimming at a diagonal, head lower than tail

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[Delapool]

Possible some sort of tumor but at a guess. Still eating and pooping ok?

 

[FallenAngel]

Yep, still normal activites. None of the other fish show any signs of anything so im thinking this one just has a tumor, shes always looked a bit malformed in the back.

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[Matt68005]

Is there re paintbrush hairs coming out of its vent?
Stringy poo?
Any poo?

Looks like an internal parasite to me.

 

[FallenAngel]

No and no, everythings normal. Ill watch closer to be sure, but i havent noticed anything

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