Upgrading 2 tanks into 1

[Simund]

I currently have a fully stocked and established 15 Gal cube along with a cycled 13.5 Gal fluval. I am upgrading these two tanks and combining them into a 47 Gal tank. If I take the live rock and filter media from both of my current tanks, will this alone be enough to cycle the new tank instantly if I move fish and tank same day, or do I need more established live rock? About 25 lbs of rock between the tanks.

 

[Subsea]

I see this is your first post. Welcome to r2r.

With respect to nitrification bacteria, your new tank will be inoculated. Expect numerous mini cycles during the process. Consider starting a tank journal in members tank forum. to document the process