I recently listened to the latest podcast live session and the ideas of different sand media was brought up. I have always used the more expensive live sand and mixed with dead aquarium sand in my tanks but I have a 190g i was looking at setting up and buying all that much sand is expensive, however I live in FL within about an hour of the beach...could i simply use beach crushed coral sand/whatever sand is there? I realize this may bring in some fun hitch-hikers but are there any other drawbacks? Is it basically the same as the sand i buy from my
LFS or is it more likely silica based?