Well, since we are on the subject of extreme stress and cohabitation with aggressive species - all the things that should have killed me long ago, I discussed this with a vet. We took a blood sample and awaiting analysis. We also did discuss the water changes over the past week and it turns out that the bloat might have been an osmotic reaction to lower GH caused by a several 25% water changes. Let's see what blood test shows, but the good news is that he's gotten less swollen tonight, so there might be a light in the end of the tunnel. I have decided to leave him alone for now and monitor.
Please do not get offended, but I always prefer scientific explanations as opposed to emotions and perceived aggression. If I find out more or if the condition changes I will let you know.