Hello all. I am hoping to gain some knowledge from you guys. I have had a purple firefish for over a year and have never had any issues. Last week I found him swimming along the bottom sand bed slowly. He had hermit crabs starting to crowd waiting for the inevitable, or to help nature along. I quickly moved him to a QT tank where he is currently. He shows no signs of injury, he is eating fine and he is not floating on his side or otherwise. The only symptom is he remains at the bottom never swimming around the tank. He is by himself in the QT and seems fine with that. I can't find anything on the net that matches his symptoms and he is going on a week now like this. Any help or direction is appreciated.