hi, i have a 55 gal tank with one 8" oscar. i had been adding stress coat to the tank in the mistaken belief that the aloe would help heal his temper tantrum scratches, howevr all it did was leave me with a horrible oily residue on top of the water. does anyone know how to remove it without doing a water change? our bio is messed up right now and we can't afford to lose any more. thanks.