Do I need sand to have live rock?

You don't need sand. What you need to do, though, is to move the crushed coral out of the way so that the live rock sits directly on the bottom of the tank. Otherwise if you get digging/burrowing fish or inverts, they can tunnel under the rock causing it to tip over and come crashing into the side of the tank! Put heavier pieces of rock on the bottom and stack in an open framework (leave spaces between pieces of rock) and work up. Make sure the rocks don't "rock" easily. There's a putty/epoxy you can used to stick pieces together so they are less likely to fall if an aminal decides to wedge itself into place (especially any sea urchin - they will try to bulldoze their way through any crack). The epoxy I use can cure underwater. When you're done, just move the substrate back into place around the bases of the rock.

Here's a link to the kind of epoxy to use:

http://www.thatpetplace.com/pet/product/advancedSe...

No you do not need sand. Dolomite crushed coral or sand they are all fine. When you add your live rock, especially if you are going to stack it, just be sure it is secure. i.e. doesn't wobble and is firm sitting. Also, before you "stack" your live rock, check it out under the water, see if there are any cridders which you want to grow. I ended up with a large clam stuck to mine and didn't even realize he was there. You may want to just leave it sit in your tank for a few hours just to see what is on it. Fan tails, corals etc. Remember to leave open spaces for your fish to enjoy as well.

Lots of luck.

No your stay sand can't kill your stay rock... if the effective micro organism on your stay rock did die off that it receives it decrease back in time... you would have had to enable the stay rock dry out, or marvel it some how with the help of replaced water circumstances that brought about it to die off.. i cant say as i recognize why your water is cloudy, perhaps some type of contaminant on the stay rock... probable no longer tho... it would sparkling up once each and every thing levels out and settles... you need to be advantageous, merely keep a watch on your water stats to make effective there isnt a difficulty.. strong success...

I dont think it matters. I would go ahead and add the live rock.

Nah, you don't need anything on the bottom. It just isn't very pretty.

yes,you do or it mash up your tank

I never heard of a LIVE rock..................is that something like a Pet rock...........

look, rocks are minerals= dead! is there such a thing as live rock?