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A long, long time... My dad had a freshwater tank for 25 years. My reef has been setup for 16 years. It is as good as new except some annoying scratches that accumulate over time. No where near as bad as an acrylic tank but, they can't easily be buffed out. This is the reason/excuse for me starting to look to an upgrade.
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Reef tanks since 1987.
Current tank: 75g SPS dominated reef tank set up in 1996
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