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i have the same question also, full 5 gal bucket of once live sand, now dry, really could use it for a refugium
i guess i can start the refugium and keep it separated from my main tank and have it do its own cycle. then slowly do water changes between my main tanks water and the refugium. dont know when, but until i know its safe, i will connect or put in line with my sump.
Yes, it will be fine to be in your fuge now, the sand from the display will quickly seed the sand in the fuge. The sand will not have a cycle spike like LR does. Good luck!
Aragonite dry(dead) sand is the same thing as live sand, accept it's cheaper, and it doesn't come with all the good bacteria on it right out of the bag, instead, the sand needs to grow bacteria on its own, which it does fairly quickly.