Dropsy or eating too much?

[Serenity]

I got this guppy today. It seems to be in good condtion when i got him  4 hours later, i saw a bad bloat on him  is this dropsy? Or did he just eat too much? I fed hakari sinking wafer to 2 cory and 5 guppies. My other fishes looks okie. water parameters are good too.

 

what can this be and how do i resolve this issue?

[Colu]

I would say he's probably eaten to much I would fast him for a couple of days I would add the wafers in when the lights are out to stop the guppies eating them I would feed the guppies a smaller  pellet based food and some frozen or live brine shrimp and daphnia