I got this a 12" scratch in the front of my 180 acrylic tank and its starting to bother me. I think I got it from cleaning the tank with a magnet scrubber and the magnet had a little sand on it. I never remove any scratches from any tank before. do you recommend any quick & affective ways to remove the scratch? the scratch isnt that deep and its on front and is outside of the tank. can i do it without removing the water? Any help would be greatly appreciated!