Thanks.so do I want the defuser I'n deep part or mid depth? The owner before me had brook trout I'n pond. They made two summers.until a otter decided to make home I'n winter.how many rainbows can the pond hold? Plan on getting pellet fed fish.here I'n northern Wi , we usually don't get the long summers as indiana, just saying your quite a few miles south of myself.2 miles down the road there's a very good trout stream and it's temp I'n July is 56 to 59, and it's full of brown and brook trout.