XG 210 One ISP, Two Different IP Blocks

Hello:

I have a WAN port (Port 2) that is connected to our ISP with an IP block of 65.170.xxx.xxx/29. We have another block of IP addresses from the same provider at 63.162.xxx.xxx/29. Both come in thru the same ISP router (Cisco 4300). There are 4 ports on the back of the router:

GE 0/0/0 (2 ports)

GE 0/0/1 (1 port)

GE 0/0/2 (1 port)

GE 0/0/1 is connected to the ISP

GE 0/0/0 has 1 port connected to the XG.

The 65.170.xxx.xxx/29 block has been up and running for several years with no issues.

How do I go about accessing the 63.162.xxx.xxx/29 block?

Should I create another port on the XG and connect it to the second available GE 0/0/0 port? Or is that incorrect?

Thanks for any help!