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Actually, the sand we have here is Silca sand, and does not buffer your pH levels. You need Aragonite based sand. You can get it was cheaper than from LFS's from places like sealifeinc.net
The way you can tell if you have the right kind of sand is to put a little in a cup with some vinigar and see if it fizzes at all....If it fizzes you are good, if not dont use it.
Now if this is for a fish only with no coral, you could use it.
As far as sea water goes, the use it in the shop Christel works at, it is actually better than mixed salt because over 70 trace elements are in the proper amounts you just cant get with salt mixes.....But one red tide bloom or collect on a nasty tide and you can have issues, you know. Just always collect on an incoming and when the water is really blue and clear.
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