Port Forward across 2 networks

I re-did my home network, added a Ubiquiti router and switch, and am using my ISP gateway for internet service. My service provider is Atlantic Broadband and I have MOCA service for my Tivo devices on the Gateway. I did not put the gateway in bride mode, and it has an IP range starting at 192.168.0.0
My Ubiquiti setup includes my wireless AP, and has an IP range starting at 192.168.1.0. Since I re-configured my network this way, I have had no issues with my Channels setup, and am pleased with the results.
My question is how to open my Gateway and my router to allow 8089 to be forwarded? Never thought of this when I set things up.

Mark

Setup a DMZ on your first router using the IP of your second router. Then add a port 8089 forward on the second router