I ♥ BBA!
I bought about a dozen nano fish a few months ago (shipped) and put them in a fully cycled twenty gallon tank by themselves. I noticed one had dropsy right out of the bag and moved it to a seperate tank where it seemed to improve and recently died. Now, I am pulling out a fish every couple days due to dropsy. I am changing the water regularly, and until they get dropsy, they look perfectly healthy, except a little skinny at times and eat fine. Any suggestions on what it could be?