Any fish you can think of can be outside under those conditions . They live in the wild that way so why not with us ? The main thing to pay attention to is the size of your outdoor set up . Too small and nighttime temperatures could cool it off too much . You won’t have them outside that long either in northern areas , only about as long as your garden , about mid May to early September . To be safe keep cooler water fish outside . White Clouds , Paradise Fish and livebearers . I’ve heard that guppies will die off at the first frost so that’s something to think about . I’ve had Betta’s spawn outdoors in the summer in a 35 gallon tub with Water Lettuce and it was fun to watch . I raised a lot of good healthy fry because the infusoria that occurred naturally must have been abundant . I never fed them until they got bigger which was fast . That 90 day sweet spot worked perfectly .
