Hello all, I just bought a new oceanic 29 bio cube. I guess I have a couple of questions. It says 29 it doesn't say 29 gallons which I thought it was but looking at it I'm not sure. How can I tell? Should I replace the bioballs with live rock in the filter system? I've been reading a lot and it seems a lot of people don't like the bioballs. I also got the little protein skimmer that goes with the it. Not sure where to put it. It doesn't fit where the intake valve is for the water and the first filter before the bioballs are. But it does fit after the bioballs and sponge filter by the water pump. Is that right? Thanks in advance!!!