Why shouldn't you mix CC & LS?

[bad_fish]

Sorry if this is a dumb question, I am still very new with SW fish.
I saw in a post that you shouldn't mix Crushed Coral and Live Sand. Why not? I currently have CC and have been thinking about introducing LS or LR to the tank. It's done in the ocean right?

 

[fshhub]

actually the reason we do not reccommend it is b/c
they will eventually seperate and the cc will require much MUCH more to give you the same benifits as a 4 to 6 inch dsb

 

[lettheirberock]

also, the larger particle size of the crushed coral will eventualy work themselves to the top.in my opinian this makes the substrate look terrible. i made this mistake on my first tank and ill never do it again. just my opinian though

 

[jcb101]

but you are right, it is like that in the ocean. I tried one 29 gal with cc and ls, and although the cc works it way to the top it also looks like an ocean bed which is what I wanted (keep in mind I wanted that image) and I have plenty of pods and worms and things in my substrate working in the cc and ls. IMO it is a preference thing. Some say that ls works better from control of nitrites, and that cc needs to be vaccumed, I have not found this to be true and other threads on other sites show the same findings as mine.