What on earth is this thing?????

[fishoholic]

It's not to often I don't know what something is but I admit I have no idea what this white/clear on one side, tan/brown on the other, flat (totally flat, no shell on it) blob thing in my sump is. The sump is dirty but I tried to get decent pic's of it. I should add that the big one is about 2 inches. Maybe some sort of flat worm????

This is the bigger one (white/clear side)


Brownish side (I circled it)


This pic (it's right above the aiptasia) is when it was turning around in the corner.


These below pic's show 2 of them, the big one from the above pic's and a little one