I've found live plants to be more trouble than they're worth. ExoTerra and ZooMed both make some very realistic plants, or you can just do what I did. Go to Michael's or some other craft place and take a look at some of their silk plants. I drilled a hole through some flat stacking stones, hot glued the plants in, then ran a pretty thick bead of silicone around the base.

BAM! Instant lifelike plants. As an added bonus, many silk plants are made with UV inks. So if you're using a "black light" type of heat bulb at night, they'll produce a cool glow effect.

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