i am building a 6’ long 4’ wide and 2’ deep in the deepest part, maybe 2.5’ deep. It will be about 300-400 gallons which isn’t very big but I wanted to know what species of fish could I keep in there other then goldfish or koi. It rarely gets to freezing temperatures here and the pond never freezes over. Could I keep some gar species in there as I’ve heard they can handle freezing temps, maybe some Rudd of perch. Any suggestions?