Also, I'm not sure what to do, our 10g has 5 zebra Danios, which apparently don't tolerate the salt, so I cannot move them to the molly tank. The only other thing I have is a 2.5g, with no lid, heater or filtration...
As cruel as it sounds, the danios are still under warranty, but what would happen if I medicated the molly in her home tank?