Ive had my turtles both inside and out. Let me tell you some things i liked and disliked. (Personal experience)
Outdoor:
Pros;
-seems like the most natural environment you can provide for them
-natural UV
-an outdoor pond will make your house look great!
Cons;
-my turtles were constantly finding their way out (even tho i made sure to fence the pond) and getting lost....i was constantly having to count them and stick my arms in the pond to make sure they were there...eventually 2 ran away and i never saw them again.
-RES are an invasive species already, if they run away and find their way to a local pond/stream its bad for the environment.
-green water. You will not have clear water...ever. A filter with a UV sterilizer will help but they are expensive and cost to run.
- you will have to hibernate your turtles in the winter. And its risky for turtles in captivity to hibernate.
-you get less bonding time with your turtles and they will be less and less tame, they will only see you as a food supplier.
-predators. Street cats...raccoons...etc.
Indoors:
Pros;
-your turtle sees you constantly and you get more bonding time.
-crystal clear water
-no runaways
- easy to provide heated water for the colder months
-no predators
-you can get really creative with their habitats and it can make the inside of your house look great
-easier to monitor their eating habits and easier to spot a sick turtle
Cons;
-takes space away
-Need to provide UV
-Not so natural
Cant think of more
Basically, in my experience, i had a indoor set up, and thought it would be better for them to have a outdoor habitat...boy was i wrong. i lost 2 turtles, i didn't like it, made me feel distant from them and ended up building an indoor pond for them. Its in my living room and guests love it. I have some chairs next to my pond where i sit and read or browse the web with my ipad. And the sound of water from the filter outtake splashing the water in the pond is SO RELAXING. My babies (turtles lol) always swim up to me and let me pet them, they lay in my lap and rest, and they look so happy. I highly recommend a indoor pond. The rubbermaid tub is a great idea, but may i suggest just buying pond liner and cinder blocks? It looks much better than a rubbermaid tub and is cheaper too depending on where you buy the stuff. Wrap the blocks with wood afterwards or hide them with decorative stone. Its inexpensive but will look like a million bucks lol...OH and don't forget to DIY your filter (;
Sorry if my reply is too long lol...its night time where i am and my insomnia is keeping me up. So i tend to take my time writing stuff out and i write really long posts haha
