I laid out this huge plan to build my own indoor pond setup in my garage, but then priced everything out and determined a 300 gallon Rubbermaid stock tank and a 250 gallon pond someone had built themselves and was selling on Craigslist would be far cheaper and easier to set up.
So that's where we are.

I've lined up the ponds, side by side. The idea is to have the basking lamp and basking area right in the middle, so that both ponds will share the space. I haven't decided on quite how I'm going to do this, whether by placing a large wooden panel over the sides of both ponds where they touch (secure, of course), or by creating my own floating docks that match up with the sides, or using shelves that reach up high enough. I will have a fence or some barrier between the two basking areas so the turtles can't leave their own pond. And I know that I will need fencing - I found that my old closet shelves did the trick nicely. They're tall enough and easy to attach and don't look like they'll be climbable. (picture shows a rough draft layout but without the door / basking panel) (and I know I need more fencing around the wooden pond - I ran out of closets)

There is a GFI outlet behind the Rubbermaid tank, and I have a GFI super-duper industrial strength magic power strip of doom that I've been using for the outdoor pond pumps that I'm going to attach to the wall right next to the outlet. I plan to have pumps in both ponds, with filters, and - do tell me if this is ridiculous / dangerous / messy / stupid - I'm hoping to pump water from one pond (with the biofilter) to the other, and then from that pond back again. The point of cycling water like that is because I was also thinking of sticking a tub in the middle of this pumping that has suspended heaters in it. So it would go Big Pond -> Heating Tub -> Smaller Pond -> Big Pond. I'd place the pumps on opposite corners of the output to try and distribute the warmed water more evenly. One pump is a 560gph with fountain that would be fountaining and pushing water through the biofilter and to the heating tank, and the other one is just a 300gph(?) pump with a regular filter built in.
Thanks to advice by ViepaCray, I created my own big carbon filter. My helper in boots wanted to test the strength. It's made from a old folding mesh hamper, a container of aquarium charcoal, and a folded air vent filter (not the fiberglass ones). And it's held together with two regular wire shelves. I rinsed it and put it under the stream of water as it was flowing into the big pond.


The hose didn't reach to the second pond so I set up a pump in pond 1 to fill pond 2. Only after two hours of waterworks did I realize a flaw in my layout: the plug for the pump was across the pond and not accessible unless I was in the pond itself. There was a lot of sighing and getting wet and then I put the pump into the small pond and pumped all the water back out again so I could scoot it a foot away from the wall. Now I have access to the plugs and everything in the back and it also gives me more room to put stuff, like an external filter or support beams for the basking area, so it was worth it.
I've run out of pond budget so I have to make this work with just what I have now.
I want to make an external shelf along the side of the round pond to make the end match up with the wooden pond for two reasons: 1, because it would give the larger turtles more living space and 2, I plan to put up a fence to keep my kids out and having flat, straight pieces is easier and cheaper than trying to work it into the curves or gaps. The fence is so the kids don't fall in and the turtles don't fall out. Safety all around. Oh, and having an extra shelf would be neat because I could put in some fake grass or some decoration for them to hang out in. Or real grass.
This is such a long first post. I'm kind of documenting everything for my own benefit down the road so I can see what I can do better next year.
Things to address:
proper barriers along the shelves
basking area setup
water heating
outside fence
webcams
???
profit
I already have half of an underwater webcam system built for the aquarium inside. I just need to adapt it for the bigger ponds and see what kind of pressure the box would need to withstand and where to stick the laptop running the show.

This is all your fault, Mr Timmy Turtle. It's ok, you're cute.







