im gonna add my 2 cents here sorry wrasseman i have to agree with greesham on this one. ive actually added both to an established tank and had no effects with either one. ive added both carib sea and dried aragonite to my tank now and my 38 i had before and had no extra effects on either one. ive actually got about 4 different sands mixed in my sand bed believe it or not. if adding dry sand i would take it and soak it for a day or to in some water it cuts down on the dust that it will add to the tank. both the live and dry sand (in bucket) i used a plastic cup scooped it out and got it as close to the bottom as possible and slowly poured the sand out. it will still cloud but if you have a filter run it, helps clean out the cloudiness u do get mine was gone within a day.