Looks like he was a bit unhappy with a couple of things in his previous tank, such as the look of the DSB. He's going to Zeo because, in theory, Zeo accomplishes the same host for bacteria that a DSB does, without the DSB. Plus, as he explains, Zeo might give him better flexibility than than DSB. You can change out some zeo, you can't just remove DSB.
Plus, as a hobbiest, once you find something you don't care for, it becomes a mission to make it better. Even though iwan's tank was much better than anything most of us could ever hope for, to him it could be "better". Good luck Iwan, I've enjoyed your threads for a long time.
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