Thanks Mike I really appreciate your response. I agree that it is critical during the Cloudy days and that is when I surrered by largest loss last year before I added the Kasco. It really surprised me that the bottom diffuser didn't provide the necessary O2 for that amount of fish. I will put it on a timer and see how I get along as I did learn from last year when you see the trout gasping for air on top it is too late. Mike, do you have any idea how much the Kasco units cost to run? I do know they are very low amperage and are much cheaper than my 115 amp bottom diffuser. I bought the one that i use from my fish supplier, who incidently warned me that the system i had wasn't enough during hot cloudy days. I, of couse being a (dip stick) thought he was old school and didn't know the bottom aerator was better. Maybe for other fish but I will guarntee you not trout$$$$. At any rate thank you for your assistance and knowledge.

Take Care- Jeff