I scared myself the other day. Just changed Gilligan's water on Tuesday night, and Wednesday morning, he looked awful! Didn't lose his color or clamp his fins, no signs of finrot or illness - just couldn't swim and kept rolling over on his side. I quickly scooped him out and put him into clean water. He was totally recovered by the time I got home from work on Wednesday and is now very happy and active again. The only thing I can think of that might have been wrong was too much salt. I couldn't remember if I added it when I changed the water, so I added some "just in case". I won't do that again!