Bloated Danio?

[AshleyNZ]

Okay, so I had a pair of Danios when I first purchased tropical fish. ( Didn't know they were schooling fish then, im on top of that problem now )
After a few days I noticed he had a swollen tummy, I thought maybe he/she was pregnant. This was October in 2012. He is still like this, he seems fine,
really active and appears healthy, apart from his belly. Is this something to be concerned about, and what do you think would've caused this?
 
Thanks, Ashley.

 

[EllieJellyEllie]

Might just be fat, if so cut down on food. A fish's eye is as big as his stomach

 

[AshleyNZ]

I probably underfeed them, if anything. I definetley don't think he's fat

 

[EllieJellyEllie]

What is the diet, flakes or pellets? Other stocking in the tank and tank size?

 

[AshleyNZ]

Tank is 65L (I have it on another post)
My fish are:
~ 2 RummyNose Tetra
~ 4 Platies
~ 1 Balloon Bellied Molly
~ 1 Red-Tailed Shark
~ 1 Black Widow
~ 1 Tiger Barb
~ 2 Serpae Tetra
~ 1 Golden Apple Snail
~ 2 Neon Tetra
~ 1 Red Neon Tetra
~ 2 Penguin Tetra
~ 2 Glowlight Tetra
~ 1 Yellow Three-Spot Gourami
~ 2 Bloodfins
~ 2 Peppered Corydory Catfish
~ 1 Zebra Danio 
 
Yes it's very overstocked, only learned about a week ago and now im trying to find homes for them all ASAP.
I feed Flakes, and sinking pellets. I dont see him eating much. 
 
~Ashley