My neon tetras has a weird bump on his/her belly what do I do?

[Coffeetoffee17]

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[SnailPocalypse]

Hmm maybe fast them/it for a day and see if it clears up.If not my guess is a tumor.

 

[DoubleDutch]

I'd worm your fish.

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[DutchMuch]

Looks like hes a runt tetra, what are your water parameters, WC schedule, and feeding regime? also what do you feed?

 

[Tyler_Fishman]

Usually my tetra looks like that when it over feeds. It's possible it's just full