Agree about the live rock. The eco rock will not provide you any of the "goodies" that live rock has.
I am not sure on time length to seed, or whether or not one piece is enough.... but you should definitely add some live rock for sure.
Seems like you have a lot of bases covered already. As for a top.... avoid a glass cover. It traps heat and gases. Make a screen cover that is closed around all edges. You can get screen for screen doors or knitting screen form a place like Michaels (As recommended to me in another thread.
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