Some of babies from my african cichlid aquarium that I tossed in the pond. They've grown fast. I've seen the RTC/TSN trying to stalk them but they are onto his game.
Hard to tell from the pics but my arowana has grown a little in length but has gotten much thicker since I moved him to the pond. He's developed sort of a green tint.
Phoenix Barbs are growing fast. Terrible pic but they are fast so it's the only one I could get.
My most recent addition is another gar someone gave me from their small pond. He's very friendly, eats pellets with the koi. My other three keep to themselves at the deep end.
Awesome Pond there.
I have a similar pond and to combat green water I added clay pellets in the bog below the pea gravel. The water is crystal clear always. The rocks do have their share of green which makes it look natural.