Been there done that!
Good deal and FREE!!!
Carb Sea and others are Selling Sand.
There is reason why you should not, but all I have ever heard is MAYBE this and MAYBE that.
I did and NOTHING has been shown in my reef to say bad deal.
If you are looking at pretty, well it is not white sugar looking but it is good.
Just drop in 3/4 full tank and let all the silt rise and turn all the pumps on and filer floss you can change for 1-2 days.
Then top it off with Argonite or crushed Coral and let it sit for 2-3 days with lights off.
Use UV if you have one and then after a few days remove all filter floss, change and add Carbon, change carbon in 3 days and then after 1 week/1.5 weeks, you are set.
Set up your bio and clean out everything for a fish/ damsel and or a cheepe and go from there slowly.
If you see the Cheepe kick it, ( of course you did set lights up) then look for major outbreak , if you do not see anything strange then try another cheepe and see if it goes well for a few weeks.
No problems with fish then try hardey coral, leather or something and go from there.
I have fill 5 tanks with FL beach sand and San Diego beach sand and I have yet to see my reefs fail.
Try to stay away from peeing dogs and people, just walk down to the water line and fill a bucket or two and see how the sea is for you.
I tried not to have the drunks pour beer in my buckets. :roll: