Firepower 2110 - Secondary Outside interface port for 1 ISP router

[eeebbunee]

Hello,

Public IP block from ISP gave is all occupied, so I requested extended IP block to ISP.

so I got new IP block with new port (same router), but I am not sure how can I make this new IP block to apply my firepower.

Here is the image what I am considering:

The blue line is about to newly add.

ISP provider gave me a notification that they are configured new IP block on 0/2 port. So I don't know If I can use same firepower. Is this possible without loop?

What else should I configure on my firepower to make it?

Thank you.

[eeebbunee]

I appreciate that your considerable reply and the suggested solution.

I should've told you in detail, I was meant to one more active routing interface not for fail-over, in this case I am trying to make both interfaces as 'active' state. 

But, your reply was also helpful to me cause I didn't know that. 

Thank you very much,