Over-skimming has nothing to do with removing beneficial bacteria, while such bacteria exists in the water column the amount of it compared to what attaches to surfaces in basically zero. Skimming removes bacteria about as effectively as water changes. Over skimming removes desirable elements such as potassium which can effect coral health. This can be avoided even with grossly over-sized skimmers by dry skimming rather than wet skimming and dosing to compensate.
In terms of zeovit the system is based on strong skimming, I remember previous versions of the guide actually stated you couldn't use a skimmer that was too large however that probably resulting in some using ridiculously over-sized skimmers meaning elements where depleted faster than they could be added. Thus the added note stating not too use a skimmer "too oversized" but you should still use an "over-sized skimmer". Also nothing official from zeovit suggests shutting a skimmer off during dosing, only to dose downstream of the skimmer in order to give the bacteria a chance to populate within the aquarium (same for the reactor mull).
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Originally Posted by ZeoGuide
As mentioned earlier, the basis of this method relies on export of harmful substances through skimming. Continuous use and frequent cleaning should be conducted in order to keep the skimmer performing at its maximum level. The results are better when the skimmer is adjusted in order not to produce too much concentrated skimmate (wet skimming). We would like to point out that it is our thought that needle wheels may precipitate certain elements and destroy plankton. These elements, e.g. such as potassium, will need to be re-added to the system. Do not use a skimmer that is too oversized or employ wet skimming if you use a needle wheel skimmer. We recommend the use of venturi type skimmers.
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