Dutch Master Gold Zone issues.

I have been using the Zone in my 55 gal nutrient reservoir at the suggested rate of 5ml per 5 gallon. I notice that after a couple of days that there is little floating particles in the reservoir. I keep my temps between 65-70, so that shouldnt be the problem. I even added half the suggested amount and it didn't make any difference. Does any one else have this issue with Zone? My Zone looks good in the bottle, so I don't think it is an old bottle or anything. I know it is the Zone for sure, because it only does it when I add it. I am now back to using H2O until I figure out what the issue is with the Zone. I hate to not use this since I have a whole bottle of it.
 
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