I've been doing some research about converting my wet/dry system. I'm not sure exactly how all this works and my LFS keeps insisting that the wet/dry is the way he does it and that should work fine. I've read that I can replace my bioballs with live rock but to remove the balls 1/4 or 1/3 at a time over a few weeks. If I do this then do I just add the live rock to the empty area where the bio balls were? Do I still let the water trickle down over the rock? I'm a little confused over the whole subject. I'm not currently having a problem with my wet/dry but since I don't have many fish and I want to get more corals added I assume I will need to change it eventually. Any suggestions? Good or bad idea?