I am running a wet dry with rock instead of bioballs. Should the rock all be submersed or is it ok to run a little exposed?? I have read mixed opinions on this so I thought I would ask here. the tank is a 75 with eshops 30 gallon wet dry. Running lifereef 36 skimmer mag 18 pump split between skimmer and return. Around 60lbs in dt and 50lbs in sump. Also using some rubble before return chamber.


