I have a female guppy, that's been through a lot of stress over the past year. She's moved from my friend's overcrowded, unclear green algae tank to mine, has had babies 4 times, has had internal parasites (was separated into a hospital tank, treated and put back in original tank after the parasitic infection was treated), and now appears to have dropsy. I do not have a hospital tank available, it's currently turned into my corydora breeding tank.

The first recommendation for any fish with dropsy is to quarantine the fish, and medicate separately. My question is, if a quarantine tank is not available, is there any harm in medicating the entire tank? My tank currently houses guppies, balloon mollies, a snail and Chinese algae eater.