I am no expert but I have not ever heard of that? A lot of folks run their systems 24/7 once you have saturated your pond with D.O. to the point where it can not hold anymore your basically runnning your system to maintain that level. Once air is established I have never heard of anyone losing fish because of over aeration keep in mind I said I have never heard of it. I am not 100 percent positive. Most of the time the big concern is getting your air started and running up to speed without hurting any fish. Once that is done your good to go from everything I have read. Think about this. I have had a 200 gallon fish tank I had LOTS of air running it it 24/7 and it never hurt those fish.
RC
