Beneghalensis get leaves that are too big to reduce though conventional bonsai means. Macrophylla will work though, as i have tried it and has great success. You could keep it in a pot within a pot, but what i have had luck with is just planting it right in the ground of a viv, or better yet mount it somewhere and let the roots grown down. I have done this before by spreading seeds along a background or planting a rooted cutting to the background of a viv. If its humid enough (which if you are doing cloud forest it will be), they will grow just fine. They look awesome when they grow this way too, giving a very old and mature look to a viv as well as providing places to plant other plants. ficus are easy to prune and shape however you want them. They also usually reduce leaf size pretty well. For the most part its easier to start out with a ficus species that naturally has smaller leaves (ficus salicifolia, nataliensis, benjamina, parasitica etc). They make great trees to have around if you have larger animals that like to climb and beat plants up. as far as the roots going everywhere, thats a good thing in my opinion. The roots will be using up water and nutrients (animal waste), and if they get allover the place in the viv, they can take care of all of that. Besides alot of rainforest plants, especially ones that grow in the understory and the forest floor, are used to growing in and around the roots of trees.
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