ID corals plz

[gregzz4]

Yup, you're right about the bubble algae

First pic looks like Acans to me. They look like they've receeded in the past and some are coming back. See the dead skeletal structures ? When they're super happy you won't see any of the structure at all

Second pic I don't have a good idea, so I'll leave it to someone else

Third pic could be a monti cap, but it's a bit blurry for my bad eyesight

Fourth pic is a branching frogspawn, and is a gorgeous critter btw. Keep it away from others it can sting when it sends out sweeper tentacles