JBJ 12 gallon Nano cube questions

Chamber 1 should have a small drain hole on the middle halfway point. Its normal for the back chamber to fill to same level as display when pumps are off. That is how the JBJ was designed.

Can you cancel the hydor order? I have one you can have.

That should be enough flow for softies. You might need a stronger powerhead depending on how you aquascape it.