Strangest Find in your aquarium?

[RayAllen]

My late night moon lit tank find inspired this fun thread. What have you found in your tank that surprised you? A horrible hitchhiker, odd ball creature or something that you have never seen before.

I will start

Last night I found a Black Limpet the size of a quarter cruising my rock work. Had no idea it was in the tank and have never had one before. Awesome!

Looks just like this one

http://i18.photobucket.com/albums/b108/frogguy1/LittleDLimpet05-23-20071_zps543ffa89.jpg (http://s18.photobucket.com/user/frogguy1/media/LittleDLimpet05-23-20071_zps543ffa89.jpg.html)

[ducati996]

I have one of those never knew what it was lol

[RayAllen]

I have one of those never knew what it was lol

I was surprised to see it last night. That it was algae or a black spot until it moved.

[malofish]

They are sometimes known as elephant limpets. Or black limpets