I have a 3" clown loach in my community tank, and so far all has been well. However, now I am observing him scraping the lower part of his body on rocks and driftwood. I am concerned that this may be some kind of a disease, however, I have not been able to make a diagnosis. There is no visible damage or parasites on his gills or sides, and although he apparently is doing it more and more, I also have guessed this could be normal behaivor? (since I have not been able to come up with another explaination) What IS this? normal behaivor or is he SICK!?! Also if he is sick, is it communicable?