If you are possibly gettting sick Sens from a LFS I would advise quarentining (and if necessay healing up of)them, before putting them in any esablished fish tank. So that your others do not get sick.
All my Sens from Walmart came with bacterial lung and fin things that I had to heal up while they were in quarentine, before they could be well enough to be near any other fish.
All my Sens from Walmart came with bacterial lung and fin things that I had to heal up while they were in quarentine, before they could be well enough to be near any other fish.













