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Anonymous
A few more thoughts for OP:
If you are really trying to make an actual "ecosystem" then you need to make sure you've got all the roles properly filled. In other words, don't pick your list of inhabitants first and then say "will this work". That's working from the wrong direction. Instead you need to pick animals that will fill the proper roles--creating food, a mini food-chain, and of course disposing of waste. This is harder than it sounds. Also, if you want a frog in there (or another predatory animal of similar size), then you are going to need a HUGE terrarium to provide enough plant growth to feed the insects that the frog will eat, not to mention that it needs to be sufficiently large that the insects can hide from the frog such that he doesn't eat all of them right off the bat thus preventing a sustainable population from developing. Frogs are voracious eaters.
On the other hand, if you wanted to make a multi-species terrarium in which YOU are taking care of the majority of the feeding and waste removal, that is much more easily done. You could fairly easily set up a wet-dry terarrium with some frogs, shrimp, fish, and plants. You would have to attend to it like any other aquarium/terrarium--feed your animals, change the water periodically, and clean out waste. You can minimize the hands-on care required by setting it up properly and by utilizing a good filter.
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