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Ringo®;942377 wrote: Is the water already in the tank? You can mix in tank for the initial setup. Having rock and sand in it already makes it a bit more of a pain. Once anything living makes its way into the tank, it's a big no no.
+1 if its an empty tank than mix away. ive done that a couple times in the past with no problems. but on my very first tank i made the mistake of mixing in tank after sand was already there and had salinity problems for a couple weeks. i tried stirring it but that just put the salt deeper into the sand and made things worse.