Bloated Danios

[TotallyTropical]

I started to notice my danios getting quite large a while back, and just thought that the females were just getting ready to lay eggs. Fast forward 5 months later and they are still the same size, as well as starting to have problems swimming. They are doing a bit of a "fat goldfish shimmy" (if that can describe it well enough), and a few even have bent spines, but they are still keen on eating. Most of my danios seem to be normal, but a few are showing these symptoms. I really want to do an epsom salt bath in the event that it is constipation, but they are still lightning-fast and impossible to catch. Any ideas on how to help them? The rest of the fish in that tank are completely normal, it's just a few danios. I can supply pictures if needed!

 

[Asteria]

Don't feed them for 3 days and see if it goes away. If you haven't already done this.
If that does not work I would try the salt bath.

 

[TotallyTropical]

Don't feed them for 3 days and see if it goes away. If you haven't already done this.
If that does not work I would try the salt bath.

 
So, do I not feed any of the fish in the tank for 3 days? There is no possible way for me to make sure that the danios don't eat anything, nor can I catch them and monitor them in my hospital tank (maybe I could if I chased them around for 3 hours). I also can't move the other fish conisidering one of them is basically half of the length of my hospital tank.

 

[Asteria]

Yeah just fast all of your fish for 3 days.
It won't matter at all. Your fish can be without food for 3 weeks.

 

[TotallyTropical]

Alright, thank you!