I had struggled with this question myself. Mostly because if the cyano. After two weeks or increased Bak and dosing coral snow daily, no cyano. You literally can't find a spot. It kept coming and going for a week and then now its been gone for days. Doesn't seem to be coming back.
Other than the cyano, I have been thrilled with ZEO. I did for a while think I may start VSV dosing instead of ZEO but don't like the fact that its less controlled than ZEO.
I guess the only other problem I have with ZEO is that they will not tell you WHAT your dosing. But I have just listened to what I was told on the ZEO forum and its worked nicely. Nitrates are still around 10-15 but slowly dropping. I don't think nitrates harm much anyways...its phosphates you have to worry about with sps.
Good luck figuring it out. IMO you should stick with it but maybe rethink the dosing schedule. I would post on the zeo forum and see what they say.
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