Thank you Greg and Jarrod both for your expert opinions on the id of the fish

It's great to have positive IDs from lionfish experts like yourselves.
Unfortunately, Lionfish #2 and #3 did not survive (both shipped in the same shipment, so I suspect that it was a rough shipment/poor handling issue).
I have reserved Lionfish #1 (different retailer and shipment from #2 and #3) and will be heading back to the retailer tonight to reserve a P. antennata from the same batch as well. Will bring both back when the QT tank is ready, so I will have a Fu Manchu, Mombassae and Antennata for now

An amusing anecdote is that the Fu Manchu is currently larger in size than both the Mombassae and Antennata. Hopefully the small size of the 2 fish means they'll be easier to wean onto frozen food!
The yellow fuzzy is on order and will come once the fishermen locate one, and the retailer that brought in #2 ad #3 regularly comes in with radiata and dwarf zebras. Hope to get those 2 in once the first 3 are properly QT'ed and weaned onto frozen food.
I intend to put the 3 initial lions through hyposalinity, with metro and prazi treatment at the same time. Hopefully that will get rid of most if not all the parasites that may be on the fish. Would this be a good idea?