Well, I'm about getting ready to put in my order for some substrate for my tank and I'm not really sure which way I should go. So many options and so many have their own preferences. I figured this would be a good topic for those who can't decide what to do (like myself) and also to see what point of view others have on the subject. I myself went with 80 lbs of crushed corals the first time around and found that it seemed to act like a nitrate factory...I guess in all of those little pockets. I know when I took out my crushed corals the first time to wash it out (to try rid myself of high nitrates) you should have seen the crap that was locked up in it and then about 3 weeks later when I took down my tank completely and put the crushed corals in a cooler, I couldn't see it for about 20 mins because the water was so mucky (and I'm a person who siphoned my substrate weekly). What are you guys using and why?