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#1
06-04-2011, 06:09 PM
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on the old tank when I had a DSB I made boxes out of eggcrate only so I was burying the bottom 4-5" of rock in the sand. If I had say 1" of sand doubt I would have bothered.
My current tank is BB and rock is sitting direct on the glass
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my tank 
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#2
06-05-2011, 12:09 AM
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When a local friend of mine first aquascaped his tank he accidentally dropped a rock from a short height and chipped the bottom glass. I believe that if there was egg crate in place (or a sheet of acrylic if you don't like egg crate) it would have better dispersed the impact and prevented the chip/crack. To be on the safe side he siliconed a piece of glass over the damaged area and so far there have been no issues in the 6 years that the tank has been running.
I personally don't have any in mine but the next time I have to empty it out to move it I will put of a sheet of acrylic in place. My eel occasionally likes to knock things over so it will help me sleep better at night.
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"We shall dive down through black abysses... and in that lair of the Deep Ones we shall dwell amidst wonder and glory forever." - H.P. Lovecraft Old 120gal Tank Journal New 225gal Tank Journal May 2010 TOTM The 10th Annual Prince George Reef Tank Tour
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