Live Rock assist?

[Aquattro]

Question about load and rock. I've just added about 80 pounds of really amazing pieces of rock to a tub, and will seed it with established rock from a display. The 80 pounds has been sitting dry for about 5 months.

I figure I'll run this for about a month before my new tank is ready for water.

I'm not confident in it's ability at that point to be fully capable of filtering my fish load. I will have lots of water for changes, but it will still be a young filter system

So, I thought about adding a large aquaclear foam block to an established tanks' sump. This should give me an additional filter block to assist my rock until it catches up.

Does this make sense, or just sound good on paper?

If it works, what impact would it have on the donor tank? Nitrate potential, or not really in that time frame?

Thoughts?