hi i just got my live rock and washed it and put it in my tank, and noticed these 3 green spots, and they sorta look like gree polpy, but idk, does anybody know?
It also looks like some kind skeleton of an encrusting coral to me...maybe montipora or porite.Touch it,if it's hard then monti/porite,if spongey soft than maybe sponge.It is most likely the dead skeleton unless you see tiny hairs/polyps poking out.
I agree with Reef.
Another way to tell if its alive(assuming it is a hard coral),is to feel if its got a slimy covering to it.
90% of the hitch hiking corals wont survive the cycle.