What you are intending to do is a recipe for disaster. There is no one on this site that is more understanding of beginners than me, but you are already wanting to create things for your first vivarium than go beyond your level of experience.
First, you can not keep turtles and dart frogs together. Period. Case closed! Second, if you choose dart frogs that volcano is unnecessary and will only cause problems. You may not realize it but the first thing your frogs are going to do is crawl down the hole of that volcano. Forget any type of water feature. I've seen very few that work good and the really good ones have been created by people who are experienced in creating vivariums. Water features are cool to look at but they have to be done right.
Read, read, read. And then read some more. Start by learning the basic way a simple dart frog enclosure is created. You can create quite a little jungle with a 20 gallon tall. Cork tubes, driftwood, and lots of leaf litter are more important to a dart frog than a volcano and a little stream. Start by going to Josh's frogs. They have sections that show how to create a simple enclosure.
Now - as far as the turtle...I have three ponds that are filled with turtles that people thought were going to be neat to own and then got tired of them.





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