Nine days ago, I picked up two sick fish from a LPS. One was a horrible tail biter with fin rot. Unfortunately, he didn't make it. He lasted eight days before he died. I tried my best, but I guess he was just too sick. Now for the good news. The other fish, a double tail plakat we named Karloff, was very thin and stressed when we got him. He hid for three days and was in pretty rough shape.
Nine days later...
Clean water and high protein diet can do wonders for a fish