Sump question

HI, I bought my equipment used. I'm getting ready to put this stuff together the way he had it set up. The water going through the sump just went through a white mesh bag, a sponge type thing, and a bag of charcoal. Also he did have a protein skimmer set up. (he said he had never cleaned it.. which I thought was odd)

Just talking to the guy he didn't seem to be a heavy weight salt water aquarium expert.

So anyway I'm wandering if the sump should have some bio balls or something in there.
Pics:

 

The BB are a personal choice, some like/use it and some dont. You did get some good used stuff. PM is a good brand. You dont have to put anything in the sump. Luna

 

Here are some pics of mine. Luna

 

Luna hit the nail on the head.

If it was me I'd put a riser in there with eggcrate so you can drop in some live rock rubble. Perpendicular to the piece that is already in there.

 

That's a good lookin setup Luna.

Jakerupe. I think that is my plan at some point. It would be easiest to do it now while I'm setting up I know.. I'm probably going to wait until I get a little more knowledge under my belt though.

 

That is what I was thinking as well.