I have not had bloat issues with them at all, at least not so far.
By doing every other day water changes of @1/3 tank volume, nitrates stay in the 2-5ppm range, so water chemistry is not a problem.
But beyond water chemistry,
I believe stress is the basic factor in the cause of bloat, and this species (maybe because of its small size) has a much higher threshold for being intimidated by tank mates, it tends to bully much larger tank ones itself.
My group grew up with a group of H carpintus, at least double their size, and were not in the least bit bothered.
I now have a pair in a 120gal with Madagascans (some triple their size), and the pair of bartoni own 1/3 of the tank.

The other pair are alone in 55 raising fry, and are very attentive parents.
