Thusly "LM" Spake Unto All:

so.. is he fat or still within the "normal SAE BMI range"?

http://lindamar02.tripod.com/fat_SAE/

She certainly looks a bit, uh, big boned.

I've only seen SAE's look like that immediately after a big meal.

It seems healty, so it's not dropsy. It could be some intestinal
parasite of course, but I doubt it.

Had it been another fish I'd have suggested it might be a gravid
female, but SAE's rarely if ever spawn in home aquaria, so that seems
unlikely.

So... It may be you've got obese SAE's, yes.