I have a cleaner shrimp that molts about every two weeks, is this too much. I know they molt while growing, but could there be something else wrong? I have him in a 12 gal Nano with inverts only. I add strontium and iodine once a week, along with the other trace elements. I test for everything else but these two chemicals. Could something be iritating it, or is it just growing that fast. No other problems in tank.