yes it would be fine as far as the bacteria and other critters you want that come along with live rock and live substrate. its obviously much more pouros being that its crushed but i prefer using both because for some reason you always get neat surprises with live rock. As far as cycleing the tank is concerned and adding that beneficial bacteria that you need to breakdown waste live sand is basically just crushed live rock or crushed coral. The other reason i like live rock is that you can do nice rock scaping with it and give a very natural oceanic look to the tank. if you plan on keeping certain sharks or rays that dont like to much rockwork and prefer the open swimming space than just going with the live sand and maybe just some liverock is just fine.
the best way is to add a piece of live rock with some nice coralline algae on it. then adding calcium to the water will help it grow. Just like any other thing adding chemicals i never feel is the best way to go. Introducing coralline from another piece of like rock that has it and then gioving it the right lighting and enough calcium for it to thrive and spread to the other rocks. coralline algae hates white light but loves the actinic light so if you dont have other species that need the white light in your tank than for now running just the blue light will help the coralline grow faster. Get a calcium test kit and calcium then bring your calcium levels to 400-420 and try to maintain that calcium level. check out http://www.garf.org there is some good info there about growing coralline algae. hope this helps and good luck.
ADDITON: you can buy live copecods if you have fish that only eat those like a mandarin goby. But again the best way to introduce any of those critters is with Live Sand and Live Rock. they are already in the live rock and live sand here is a link that may help. http://reefs.org/hhfaq/
they could be flatworms and in some cases condidered parasitic. try to identify them on wetwebmedia.com If they are flatworms removing them gently with tweezers should be fine.
ADDITION if you can post a pic i could help you identifying them.
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craig
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