If you like how sand makes the tank look, then add sand. If you like the look of bare glass on the bottom, then don't add sand. Both methods have their strong and weak points for maintenance. True deep sand beds are problematic and little used anymore. Most sand beds are just for aesthectics or to provide realistic habitat for certain livestock such as pistol shrimp, gobies, jawfish etc.
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I retired and got a fixed income but it's broke.
Ed
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50 gallon FOWLR, 10 gallon sump.
130 gallon reef, 20 gallon sump, 10 gallon refugium.
10 gallon quarantine.
60 gallon winter tank for pond fish.
300 gallon pond with waterfall.
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