If you don't see any more little "scratches" then just leave them the hell alone. They look just fine and I don't see any glaring problems. This other dude has pretty much told you ever god damn thing under the sun, calcium, no magnesium, flush them, mist them, pour garlic shit all over them...
Just water them and let them dry out really well before you water them again. like REALLY dry out. If you absolutely must fuck with them, spray them with some kelp water.
Otherwise, just stay the course dude, stay the course.