Boosted Cardinal Tetra

TheNacho

I have a 29g tank, some of the fish I have are 4 cardinal tetras that I've had for 4 months now. Recently I've noticed one of them looks bloated, near its head, also it seems like it's constantly moving it's mouth as if its eating. Otherwise no change in behavior or water parameters, all fish including this one behave as usual and have an appetite. Is this a reason to be concerned?

Pic attached: bloated fish is on the right
 

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StarGirl

It almost looks pine coned too. Can you get a closer shot?
 
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TheNacho

Can't.. They're too fast and hide behind the plants when I come near the tank. I can't see any pineconing but the red on this one fish looks more faded than the rest.
 
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