If you're serious start reading up on the zeovit site. Lots of info there. I use Biopellets since I was already running them and just start adding the zeovit acids and foods.
The ZEO method is based on have the zeolites, adding bacteria and a carborn source which the bacteria eat and colonize on the zeolites and consume ammonia, nitrates, etc. Seems like alot of upkeep. Biopellets are a carbon source, your bacteria colonize and eat from the biopellets, you set them and forget them, add some every few months as they are consumed, but thats it. They do the same sort of thing, increased nutrient exportation, because of a higher amount of bacteria in your system, but not in your display, same as normal ZEO. I'm using Biopellets in a zeovit reactor. I had them in a TLF reactor but couldn't fit very many. You can run Zeolites in a TLF reactor but you can put very much in it. So if you have a small tank, 20-30g, that might work fine. Has to be at a certain flow rate.