I would think instead of doing a solid background you could create "stair steps" by siliconing rounds and shelves along the back. Something like this:http://www.frogforum.net/vivarium-te...-treefrog.html and then using tall plants to fill the vertical space.
(Which is my inspiration if I can ever find some time to be inspired instead of tired.)
When you say hydroballs do you mean the small brownish clay balls, or do you mean the blue or black plastic spiky balls?





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. Make sure you have a way to access the water that accumulates to siphon it out as it builds up. One way is in the link provided- have a little pond that joins with the drainage (by the way thanks for the compliment Lacibeth!).
