Okay so i got some live rock today. I was told i could have his live sand for free well come to find out it is real fine crushed coral. Should I use it. He said it was just as good as live sand(there were a ton of critters in there) and would hold my ph better. So should I use it??? Also he said the sand sifter fish like gobies and blennys would have no problem with this stuff either. Please tell me if i should use this in my display???? I know yote said not in the sump