Lots of people question turning on an aerator 24/7 particularity this time of year. I use a surface aerator all summer and go to the bottom diffuser in late september. You could have some problems turning it on now so i would gradually acclimate your pond and fish to the diffuser slowly. I'm sure Cecil and others could give you specifics but i turn my diffuser on 4 hours/ day to start and work up to 12 hours by adding an hour per day. I do this slowly just to avoid an agressive mix all at once. I don't know about Cats and Bass and the effects of turning it on and leaving it on, but on trout you need to make sure that the temps don't become to warm. Also, if you are using a windmill to provide the power it will be a challenge to manage the time. One of the experts will post as well and give you a much better answer.

Jeff