Maybe start with the first one (it's cheaper). I just started zeo and I'm only using the starting ones and have noticed quite a difference in water clarity. My wife even noticed it and usually she doesn't comment on the tank much. Later you might decide to try an additive here and there based on reading/recommendations. At least that's the route I'm going. So far I'm happy with the starter... I might just stick with the basic 4 if all looks good.
Others can probably give you better feedback as I'm still quite new to zeovit.
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