Clownfish has dark fat stomach

[reefNetWork]

I am wondering if anyone has ever heard or had experience with my problem. I have a pair of ocellaris clownfish and they have fat, buldgy, dark, greenish stomachs. they are swimming regularly, eat normally, are very active, but have fat dark stomachs. anyone know whats up? help appreciated. thank you

 

[reefNetWork]

also, no other fish have this problem, just my clowns. other fish are, pair of prawn gobies, 6 line wrasse, blue dot naso tang, and a spotted cardinal.

 

[pogiboy67]

one of my fish seem to have this probelm as well..clown...is it a parasite? how do we fight this if it is?