I'm pretty sure there's nothing aggressive. Other tank mates include four other cpd, 4 cory cats, a couple of shrimp, and about a half dozen snails.
Honestly I'm getting ready to euthanise. This is way beyond what my capabilities are as a fish keeper, and he's just floating at the top of the water now. I want to put him out of his misery... Poor little guy.
It didn't really happen over night, so to the speak. I suspect it started several days ago, however work has kept me very tied up for the last couple of weeks and I haven't been able to do anything more than water changes and feeding. I just noticed this yesterday, probably way too late