We flushed and replaced all of our fish the other day. It wasn't planned so much as an oops. We went to dump in some algae killer and I misread the label. Instead of putting in 1ml of killer I put in 10. The Mickey Mouse Platys did not not take kindly to this mistake and gave up the ghost. The plus side is that the snails didn't like it either. We've now moved on to a single blue Betta. He seems like his new spacious and heated digs. It should also be a lot less work to clean with one fish instead of the dozen or so that previously overloaded the tank.