im looking at changing from crushed coral to sand but i dont what kind to go with? i was wondering what ppl's opinion on which sand is the best marine sand money isnt really much an issue but i dont want to go all "live sand" cuz thats wayyy to expensive even tho im sure its very bennificial.. and whats the differance between "live sand" and "agra-alive"? also how important is the sands pH buffering capability? thanks