Does anyone know what this is?

[Spotted]

Is this ok to keep in the tank or does that piece of rock need to come out?
The second pic shows 2 white spots, one in the middle and a second to the right.

 

[Ricksreef]

Is this ok to keep in the tank or does that piece of rock need to come out?
The second pic shows 2 white spots, one in the middle and a second to the right.

Pineapple sponges,good to have,filter feeders.