I've got a couple

[zsqure]

I have two of these slug/snail looking things. And a "plant" or something that hitched a ride on some zoos that I got fromSWF.com The plant thingy didn't get bigger under my MH but seemed to grow under the pc in my nano. My zoo population seems to be dwindling....

 

[keri]

bottom pic is a stomatella, harmless grazer
the macro algae is....I dunno. I have something simmilar in one of my tanks. Ask Cranberry

 

[renogaw]

algae sorta looks like kelp

 

[spanko]

Looks like Sargassum algae to me. Here is a picture for comparison.