2 new inhabitants - what are they?

[kimts]

These 2 white growths are new, within the last couple of days. Any idea what they are and if they are safe to stay? They are the white spots at the base of these corals.

 

[ISpeakForTheSeas]

These 2 white growths are new, within the last couple of days. Any idea what they are and if they are safe to stay? They are the white spots at the base of these corals.

I can't tell on the first three pics, but the last two show a sponge (probably a pineapple sponge), which is most likely harmless.

Any chance you could get a pic like the first one but under white light instead of blue?