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I have never changed my sand bed, but I have moved twice, which involved removing all the rock, corals and fish. I moved the tank with the sand covered by 2-3 inches of water and each time I got to my new house that water was very dark and got siphoned out before I put new water in.
So I would say twice in 6 years it got a really good cleaning, but it's never actually been replaced or added to. I used a few cups of that sand a few months ago to seed 2 other new tanks of mine.
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75G RR, Trigger Systems Ruby 30S sump, 2x250 MH and 4x54W T5HO, Octopus Diablo XS160, 4" DSB, 2 x MP40wES, 85 lbs LR, 2 x BRS Dosing Pumps, Finnex 300w titanium heater, Surf2 Algae Turf Scrubber
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