are they inside or outside?

important thing to remember is that acrylic and water have the same optical clarity... so scratches on the inside, when minor, can fill in w/ water and dissapear... until they fill in w/ coraline. ;)

practice using your scratch kit on an area your won't be viewing much first, seriously, you can cause more damage doing it wrong that just the scratch, optical distortion looks nasty.

acrylic tanks are gorgeous for how clear they are, but i hate how easy they scratch. i'd rather chunk out the change for starphire glass.