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You could also gain water volume in the fuge by moving it to the far right, use the tallest possible baffle, and feed the fuge by tee'ing off the return.
Using the Marine pure balls is up to you, it really does the same job as live rock when used passively in the sump. So unless you want a limited amount of rock in the display it is probably not necessary.
However, later down the road you could use them in a nitrate reactor like this: https://www.reef2reef.com/threads/poor-man-nutrients-control-donovans-nitrate-destroyer.302685/
Donovan's reactor does work, I can tell you first hand.
@Donovan Joannes