I <3 MS Paint!

I was going to set it up with bioballs both above and below the water level, but then someone suggested using pumice instead. I'm not so sure because once all the pores clog up with muck it'll lose a lot of its surface area and coud end up doing more harm than good. Other than buying expensive LFS ceramic noodles, what else could I use for the submerged media? I'm going to have some coral rock in there to counter the big pieces of wood in the tank, but obviously don't want to fill it up with that as I'm keeping loaches and SA cichlids.
Suggestions?

