Crushed coral

Can anyone tell me is this crushed coral?

 

Looks kinda like it Jerry, its hard for me to tell from the pic on my garbage computer!

 

??? Isn't crushed coral lighter than regular aquarium rock?

Where did U get it?

 

Unfortunatly I bought the tank set up already. There is also sand in the tank, not much though. I want more l/s ultimately

 

if you add sand to crushed coral it wont take long befor all sand moves to bottom and the CC will all sit on top.

 

Thats what has happened. If i take out most of the coral and add l/s slowly first is it possible......and would new live sand start a new mini cycle?

 

You have to add twice the depth of the crushed coral to cover it.

 

Not to quote myself but.........

 

If your tank already has live rock in it then it is likely that the sand has already 'cycled' and won't go through much of a cycle, the addition of live sand will probably add more life to it. How long has the tank been set up for? Is there live rock or sand in it already?

 

See the thing is there is rock in there and sand im sure its live but i really dont know what the guy did to it. What if he bleached the rock. He said he had the tank for three years. Fish in there when he had it were four large fish. I have been vacuuming up the rock as much as i think the fish can stand(gets really cloudy when i do it) but im thinking im gonna start vacuuming up as much of anything i can sand and all. I want more sand than anything. I know iwas told not to add l/s to an established tank. I appreciate the help!! p.s. I have had the tank for almost a month now.