Grab 5 if you can, he will empty that tank in a hurry. Use three to establish the 10g, 1 to re-establish the tank itself, and keep one in reserve and ration it until the 10g starts colonizing. In the mean time, keep feeding the prepared foods. Sooner or later you will get a nip or two. Keep in mind that transferring pods between tanks will be a pain. Try using a rolled up plastic mesh scrubber that are used for cleaning dishes to tranfer pods. Cover it in live rock rubble, or you can transfer the rock itself, but you may have better luck with the scrubber.
With the 55g, I would worry that the blenny and goby would outcompete and/or abuse the scooter.