I have 50-60 lbs of what was live sand sitting in plastic tubs for about 2 weeks. Didn't have the know-how or equipment to keep them up and running in water. Was only able to cycle the live rocks.
When I got my used sand I rinsed for about 30-40mins. Made sure when I stirred the sand it was crystal clear.. I did my order a bit backwards. My tank was filled with water first for the first week. After the sand was clean I then dumped the sand in. I poured it in slowly so there wasnt that much of a sand storm. Took a day or two to clear.
As of right now tank is running fine. Been keeping tabs on it though to make sure nothing goes crazy.
How much sand are you looking for? I have a small tubfull, probably at least 30-40+ pounds of dead sand that I don't need anymore that you can have. LMK.
Not sure how much sand I need. Most of the floor space is cover with rocks. Tried not to over do it. Can take a look at the cloudy picts of the tank with rocks set up.