First I would say its not so much the gals need as actual sq. footage space the turtles have to swim in. If you have 4x4 or 4x6 with depth of 2-3ft you could keep 2 to 4 turtles depending on size and aggressiveness. Sliders and Cooters make great pets but get fairly large and bask a good majority of the day. Mud and musk are small turtles but are def more aggressive and need to be able to get away from each other. As far as the outside temps you giving are concerned, Unless a tropical species, non-native to the States, you can keep just about any semi-aquatic outside year round with no need for a heater as long as the water isn't going to freeze solid; since most U.S. turtles are used to cold weather changes. Also the only basking light you'll need is the sun; I live in north Fl. and even on days in the low 50's my red-ear basks if its sunny out. I a 120gal and a 180gal preform pond buried in the ground without a heater or light with common musks, stripe neck musks, large red-ear, mobile cooter, yellow belly slider, and peninsular cooter that stay outside year round. We get daytime temps usually 50-60 and sometimes low 40s with nites sometimes freezing and never had a problem. Hope this helps

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