Hi, seen this talked about many times, my turn.. If a fish has a swollen belly how do you tell if its a infection or eggs? The severum age, if he is the older one maybe 20, younger one 6-10, getting them mixed up, I think the older one has the swollen belly. Anyhow, he/she has a very swollen belly, how do you tell if its eggs or infection, etc? He seems fine, moves/swims fine.. not sure how much he/she is eating. How do you tell if he has an infection or something? Hes in a 130g tank, If I move him to a 30g he might freak, but then again not sure how it would act.