Need Help! Just Got New Nano(Cube Master)

tugglife2

Member
Today we received our new Cube Masters 12 Nano. This is our first experience with a nano. We bought it from a website for a pretty low price. We open the box and the only instructions are for the submersible pump. It appears that this system is a cheaper spinoff of the JBJ nano cube.
The back of the tank is what has me confused. There are four chambers. The far left chamber has a small black box at the bottom. Is this the pump or power head? Attached to it is a tube extending up and out into the tank. The next chamber has some bio balls on the bottom and a plastic bag with some stony things inside. Are these stones supposed to be dumped in the chamber with the bio balls?
 
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