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So i have my new 55 all ready, sand substrate, and have about 50lbs lace rock from old tank...

I always see tanks with rocks loaded up on back, corners etc, but always wondered how this does not just scratch up the inside of tank?
 

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Since the rocks are not moving, they tend not to scratch the glass. The scratches that I have in my tank tend to be in the front glass, and are due to algae scrubbing. The magnetic scrubbers are particularly bad in my experience, since they can easily pick a grain of and and debris, and then disaster strikes...
 
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