Fully agree with DC. Your tank is very cool as is. Try to let it settle and enjoy it for awhile. As far as the waterfall, mine love theirs and are always sitting on the flat rock letting it flow around them. Just make sure it flows onto something they can chill out on and not to strong but they don't mind a little flow and it keeps the water from going stagnant and moves the detritus around.

Why not just build an extended screen enclosure and place it on top for some plant height?

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