Bubble algae and ??? (Tufty white growth) on zoa frag?

[ELBee]

My husband knows that zoas are currently my favorite because as far as corals go, they're pretty easy to care for and their colors are amazing! He surprised me with a frag yesterday and i was thrilled! But upon further inspection, I have questions

Tbh i find the bubble algae pretty neat to look at, but I'm afraid of it going out of control. Should I just try to scrape it off over a separate bucket?

Also, if you closely there are tufty white tubercule-like structures in there. Seems alive. What in the world are these 2 things?

 

[york1]

Pull the frag out and scrap/brush the bubble algae off. The white stuff looks like sponges which are harmless but you can probably brush them off too

 

[hzheng33]

sponge for the white stuff...but i would lightly brush it off as well since it may suffocate your zoa.

 

[chuck]

Sponges yes. R/o might be putting silicates in tank. Unless tank is very long established