I've had it all and the only thing i can add is that if using the big size broken coral, watch you calcium. i used number 9 sand i think. It leached calcium in to my system. It was basically broken pieces of dead coral or something. Now i use sand and vac it every so often, very slow as to not stir it up in the water.
, beside there is a chance that sand could get vacuumed into the filter.