u/Born2construct

Space invader in first pic for some reason is bubbling / puffing up. I’ve had these for years & I’ve never seen this before. Recently fragged off the mother colony & have 6 of them around the tank but this is the only one with this issue. Looks like it’s releasing from the skeleton but from underneath, maybe? Really worried, not sure if I should remove ASAP. (Other Space Invaders around the tank in other pics)