While I'm not currently thinking of building a salt-water tank, I might do after a few years of experience.
I've seen a lot of YouTube videos and online tutorials that feature different coral setups in their tanks.
They sure look nice, but where does the coral that is in stores come from?
If they're coming from the ocean (The biggest aquarium of all :D) and already-depleted coral reefs, it would seem a bit unethical to me.
Is it possible that there are suppliers that farm coral? I don't know much about coral but it seems like it would take a long time.