Secondary in Corny

I want to secondary in a corny. Should I put a blanket of CO2 on it or just let it secondary like in a bucket? I need my bottling bucket for another barch.

No reason to add the CO2. Do it just like you would in a carboy or bucket.

i would add the co2 to ensure the lid was sealed.

Just secondaried in a corny for the first time, but certainly not the last! Dry-hopped in a bag, held that in the wort using a small piece of clear tubing to clamp it to the gas-in tube. Took maybe a minute to sanitize my hands and the lid, open it up and remove the bag and get the lid back on and corny pressurized! I have it under high pressure, so I plan on drinking some Monday night.
I did shoot CO2 in and vent the O2 out when I racked it in to the corny a couple of weeks ago.

I always use my corney as a secondary...and you should put CO2 in there and purge a few times to get any Oxygen out...I do this about 1 to 2 times a week...not too much CO2 tho...