i have the bio cube 8 but i believe that the lights in the nano cube 24 is a little dim. it really depends on what kind of corals that you want because all of the corals i have in mine are doing great with the stock lighting in it and i have some button polyps and various types of zoanthids also some ricordia. In my oppinion i think that the bio cubes are better built. oceanic makes the bio cubes in 8,14,and 29 gallons. come back to this thread if you want me to do a little bit of research for you because i really dont mind.