bad bug?

What up guys first post here bought this Goni a week ago noticed a small mass I thought to be a baby rock flower nem at the time it was only about a half a mm very hard to see but now it’s gotta a bit larger probably almost 3 -5 mm it’s stationary and doesn’t effect the coral this pic was at...

I am wanting positive identification on several different creatures currently in my tank… mostly because I want to know what they are and where they are endemic to. I am building about as close to a Hawaiian Ridgeline/ central indo-pacific ecosystem with all sorts of life that’s habitat/ or has...