my shovelnose catifsh is shedding . he is eating very good and is about 9-10 inches but today i noticed like a mucus or slime coming off of him, i called my lfs and the manager there told me its not that bad and a couple of water changes and he should be fine but if not add antibacteria medicine. i have a stingray in this tank. first of all do u agree with him and 2nd of all will medicating the tank effect my stingray? thank you