Bio balls won't clogg as easy. I find bio balls are almost the first step in filtration for wetdry setups depending on what your setup is. Using matrix would have the possibility of clogging up easy and you would have to rince it out all the time.
Another theory is that air can circulate around the bioballs better than media that is compacted together.
I Would personally use Bio Bale. Lots more surface area
Another theory is that air can circulate around the bioballs better than media that is compacted together.
I Would personally use Bio Bale. Lots more surface area