ok, in the first pic it's not the sponge but the little white thing in the centre. It started out with 3 legs and now that one has about 6. the second is of the same thing but a different one. its stuck to the top underside of the rock. they move around the tank, but not to quickly. It's white but a little darker in the centre of its limbs and body. Don't really have much more to tell on it. Now the 3rd pic iswhat the little blob on the rock is. its kinda cone shaped with a little tube coming out the top. there are quite a few of these throughout the tank and they kind of appeared all at once. if anyone has any ideas i'ld be grateful.