I would suggest Ultralith over Zeo, as it looked more simple when I was looking to do it, and it was less expensive and less time consuming with less additives. Either way you've got to use their proprietary "zeolith" rocks in a chamber, and you'll have to dose either Amino Acids or bacteria food or something to get it working. So if you are seriously considering it, you'll need more equipment and to dose consistently into your tank. As long as you're okay with that, then you're good to go, just pick a system. I would strongly urge you to look into ultralith.