I have a 20 gallon high and up until this afternoon I had 2 green terrors, one juvenile female and one adult male. The male, Dexter, was in my tank for a few weeks to recover from the beating he took in my friends 55 gallon but my buddy picked him up earlier. The water was getting a little murky so I decided to change a good portion of the water. I took out the female, Rita, and a pleco and while I was cleaning the tank Rita jumped out of the container I had her in, luckily I noticed her on the floor while she was still alive and put her back into the pot. When I put both of the fish back into the tank Rita went to the bottom and sat there. I thought this was normal because it's what she did when I first put her in. I went to get guppies for her and when I came back she was on her side in the front of the tank. Her eyes are getting milky and her gills aren't moving very fast. I'm assuming that she'll die, but I can't do anything except keep my fingers crossed. What could have gone wrong? Was it the fall onto the floor or something else maybe? Any advice is helpful. If she does die I'm probably going to restock my tank with african cichlids.