Fish ideas for this outdoor system?

I have a 35 gallon outdoor tub pond with a 45 gallon filter on it. I maintain it weekly, removing leaves and clogs. I used it for white cloud minnows last year, but their surface swimming got them into trouble with fisher cats and raccoons. I though rosy red minnows would be more suited. They are hardier and swim towards the bottom. Right now the temperature is around 55-60 degrees F. The pond is under my deck and receives dilute afternoon sunlight. I live in New England. What other species might work? Flagfish? Mosquito fish?