I got them from the only non-chain lfs in our area about 4 months ago. It's been in business for many, many years and is pretty reputable. No I have not fed them any live food. In fact I was talking to my gf about that just last night. I did feed the tank some peas today though. I have not tried anything as I only started suspecting there really is an issue. The lesions with the discoloration and bloating led me to DGIV. The dwarf gourami is crapping himself silly as I type this with long strings of white poop.
I also have 10 zebra danios, a pleco, 2 (rescued) xray tetras and 2 (rescued) glow light tetras , a yellow shrimp and 2 nerite snails. They all look healthy. Water parameters look good.