oh well i kinda dream on how cool a ying yang tank would be. like a 6 foot round tank which is really 2 tanks 18 or so inches tall and one side have normal aragonite sand and the other have black aragonite sand. on the dark side tank have an aggresive tank like a puffer, eel or 2, stingray or 2 and a small shark. and then on the lighter side have a peaceful reef.
it could be a table if you put a cover on top. but ya i think that would be cool. lol