I shifted from Zeovit to AF just because cost effectiveness. I heard bad things about zeovit as well as any other systems. I think the only issue we have with all these ULNS system is that you live on the edge with all these systems. You dont have a lot of margin of errors. A little system change can lead to a lot of major impacts. But its not the issue with the system or the method its always we the users who missed the point. I always try to understand the basics or the science or the logic behind what is happening in the tank. I just finished running my AF system 2 months without any water change. The corals are fine and parameters are all nice. But I will not do it again and possibly continue to run it for a month before I do a water change....I feed quite a lot but still my nutrients are quite low...



