Male FBT bloated

[Monty]

Hello everyone,

We have three FBT, but since a few days I find that out male toad is really bloated.
Could this be because of a parasite (like worms orso)? Or maybe a digestion problem? Or did he just eat all of the food - meant for the three of them?
Is there something I can add to the food or water just in case it is a parasite, but won't harm them if it turns out to be something else?

Thank you very much!