Coming from a complete newb when it comes to salt water, I read this whole thread, and was wondering how to tell when the tank is full? The corals are awesome looking, but seems like they are almost sitting on top of each other. Is that how they are supposed to be? Do you put new ones right on the sand? Or do you add more rocks to attach them to? Guess you can tell I know zip about this, but would like to know. Also, the blue lighting, do all SW tanks need it to grow?