Opinion About My New Otos

I noticed that there were a couple of rogue Oto's that were living amongst other species and had clearly been in residence for a while, so a couple of weeks ago I asked them to be put aside.
They're nice and chubby looking and a little larger than the ones in the Oto tank.

So, I plan going tomorrow to collect the two and select 4 of the fattest from the Oto tank. (buy 5 get 1 free)

Now, the pair I've already chosen have been in isolation for a fortnight and I checked them over last weekend and they look fine.

My question is this: should I put all six in quarantine, or should I ask LFS to bag separately the two and introduce them into the main tank immediately (as I feel they've, effectively, been quarantined already) and put the other 4 in quarantine.

What's your opinion?

Doh! Of course! I hadn't even considered the fact they're all on the same system.

Thanks Sue. I will quarantine them all as usual.