Discuss we will!
Short story: CC sucks. Aragonite sand rules.
Long story: CC has large particles. This means that detritus and garbage gets stuck and trapped in it easily. Nitrates build up, leading to algae problems. Sand-sifting animals that normally would keep the sandbed clean of this detritus can't live in CC, so if you're planning on getting a sand sifting star or a sand sifting goby, you're SOL. CC also doesn't have the buffering capacity of aragonite sand, so you may be in for some pH swings eventually. Aragonite sand keeps your pH stable, is easy for animals to keep clean, doesn't trap crap and stays looking nice and white.