Terns - Great Barrier Reef October 2016 (1 Viewer)

Last week I photographed Terns from the Marine World platform on the outer reef. I am unclear how many species I found - somewhere from 4 to 7. Certain were Common Noddy, Bridled Tern and Greater Crested Tern but I was unclear if a few of the Terns were faded Sooty Terns. In addition there is a Tern in flight showing very pale upperparts [?over-exposure] and 2 perched Terns [?Black-naped and Roseate or 2 of either perhaps]. I would value any expert opinions.

Firstly the rear Tern in the first 2 shots
Secondly the Tern in the front of shots 3 and 4

Tern in flight, a composite of numerous shots

Lastly 2 Terns perched

Here are 3 more photos where I wondered if some individuals were actually Sooty rather than Bridled Terns

the first shows an apparently larger bird at the back
the second 3 birds at the front with darker mantles [?trick of the light]
and the third with a bird at the front whose forehead pattern does not seem to be an obvious Bridled Tern

I'm no expert but I'll have go. No Sooty Terns in any photos. All the Terns in post #3 appear to be Little Terns.
I don't know what the bird in flight in post #2 is, possibly just a Crested Tern.