Hi Matey,
Water params look fine give it a week or so and I reckon you will have Amm and rite at zero. Calcium is high but will drop as corals/coraline use it up.
I cant tell what the first pic is, try and get a more focused pic. I dont think is a christmas tree worm though. It looks pretty...
Second pic I am 99.999% sure is a Majano anenome, not somthing you want in the tank, They breed quickly similar to Aptasia and will sting corals when you put them in the tank. Wait until a few more ppl have a look and confirm it is Majano then nuke it with Joes juice or somthing similar ( if ya cant get joes juice make a calk paste and inject that into it to kill it).
Third pic I reckon is a sponge of some sort. I was thinking algae/sponge but the larger, roundish one makes me think its sponge...nothing to worry about.
Wheres the FTS? :hammerhea
Cheers
Tim