Hey Raggs, been a while.
If the fish are losing scales, that could be a MAJOR bacterial problem. Thing is for the fish to become that susceptible would require them having virtually no slime coat. This, in turn, is indicative of some form of chronic stress at a level high enough to suppress the fishes' immune system. Most all fish health problems, except possible some of the viruses, can be traced back to chronic water quality issues. The source of the problem should be determined and corrected before a course of treatment is started.
I agree, first thing that should be done is a comprehensive water test.
Yes, Dropsy would include bloating. I asked, because many times, a question is posted and the poster, in the haste of the moment, will leave out important facts not realizing that they are important.
"Everybody is ignorant, only on different subjects." - Will Rogers