one of my silver tipped tetra has an enormous belly, but the right side of its belly is more sticking out than the other, its swimming about 70% properly it looks to be struggling a bit, does any one know what this might be i hope its not worm infection because they can be really nasty and infect the tank, iam hoping its just a tumor, i doubt its pregnant because tetras are quite hard to breed let alone in a community tank like mine, any help would be great.