The 75gal reef tank cycle has started!!!!!!!

Hey guys I need some help IDing something. There are these 3 things in the tank that we don't know what they are. They are all the same but different sizes. They have 2 spouts, one bigger then the other. The spouts have little hair like thing on the openings. I would take a picture but they only come out at night and when I use a flashlight they retract into there holes. At first I thought they were some kind of clam but I'm not sure. The first one I saw is in a clam shell that is encrusted in the rock so I guess it was a clam but the others I found last night are not in shells. Do these sound familiar to anyone?
 
Yeah I just found one that is kinda out in the light so I will try and get a picture.
 
I think I got a picture. Only one of it's spouts are out but it might be enough.

Live Rock 1.jpg
 
OK hold on I'll put something around it.

Live Rock 1.jpg
 
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I hope that helps.
 
Maybe a tunicate? This isn't a good shot, but it is a close up of one of mine:

squirt.jpg
 
Yeah that is kinda like them but that one looks like it might be bigger then ours and so far they are brown in color.
 
What the hell is it? is it good bad or other wise?
 
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