I noticed that my fish kept 'rubbing', so I went down to the fish store where the guy told me that I had some kind of parasite and I should use Kent Marine RxP. Anway my Tire track eel died one day later(which was never even rubbing before I used the stuff). Now my Cacautoides is always hiding under something at the bottom of the tank. I know that the bottle is for marine use but the guy at the fish store insisted that it will work for my tank.