I assume you're referring to Gynura aurantiaca?

If so, no it's not at all rare, but don't let that stop you from admiring its beauty!

As long as none of your critters are herbivores, no worries on that front.

B est of my knowledge, its a terrestrial and does not like to dry out completely.

Your biggest issues:
1) pruning will most likely be necessary (personally not a big deal to me but some folks don't like to bother with such things)

2) & this is the BIG one ... your lighting. From what you've said, it sounds like it will be totally inadequate. (One of the most surprising things to most people is the fact that just because the light seems bright to OUR eyes, that does NOT mean that the light will be bright by plant standards.) Heat lamps -- at least the ones I am familiar w/ do not produce enough lumens in the range plants require. Instead their output is typically geared for heat (obvious, I know). Your one fishtank light is unlikely to do the trick either but more info would be needed ... such as what is the wattage & lumen output, and is it the type of light used for corals? Also how far will the plant be from the light? W/out sufficient light, Gynura aurantiaca will lose its purple hairs (they're actually formed as a defense mechanism in response to high light levels to protect the foliage from sunburn) and will get weak and 'leggy' over time as it attempts to stretch towards the light.