ok, so here's why i'm not doing a pond, i live in northern oregon, it snows and freezes most winters, and also, i'm renting a house right now, and can't afford to build a pond currently. however, i have several large tanks, i'm rescuing the turtles from one communal tank that they are rapidly outgrowing and i already have several largeish filters, and a huge sand filter i'm converting to bead, like people use for koi ponds. i have a 75 gal, a50 gal, a 65 gal, and the turtles are currently living in a 55 gallon tank. this is how i'm currently planning upon setting it up. there's one res that's 8 inches, one yellow bellied slider that's 8 inches, and a painted turtle(the owner didn't specify which kind) that's five inches. i have light fixtures i can use for the basking area, water heaters i can set up, and i already have a breeding colony of feeder guppies. i've done the research on what they need nutritionally and such, as well as about the lighting. doesn't mean i can afford it yet but i get paid 2 days after i get the turtles, so the more expensive lights can be bought then, they're going in an outdoor greenhouse setting, that will be insulated and heated during the winter. sorry for the lack of information in the original post, i just didn't have much research yet and i was falling asleep.