Just a few identifications please!

[kymbra]

What does a copod look like? I have a lr with mushrooms on it. I have a snail looking thing that moves around, but never leaves the rock. I also, (on the same rock) have a strang thing that has two holes. Looks like a blob with two holes that open and close. It is always the same size. Doesn't seem to eat, move or really do anything for that matter. When I first bought the mushroom colony, I though is was a blue mushroom splitting. Since it hasen't split or done anything for that matter, I just would like to know what it is. Sorry, I don't have a pic.

 

[fender]

A copepod is a small white dot about the size of the head of a pin. The snail looking thing may be just that - a snail, if it doesn't have a shell, it may be a sea hare or a nudibranch. As for the thing that does not move and has two holes - probably a sponge. I have many different sponges in my tank, that are various colors, from white pineapple looking ones to blue/grey blob like guys.