new discovery

[jeffaroo]

I have recently discovered a new THING in my tank. It looks like a white" milk dud" that has a sucker under it like a snail. it is kind of transparent with white markings on it. its about a 1/2" long and 1/4" wide . ever since i discovered it, i have found 2 more. any ideas ? ? ? I have a small Blood red alge patch and they only stay around that area, and yes, they do move. about twice as fast as my turbo
snail, when it wants to move

 

[blackcloudmedia]

Pictures would help. Do they move? Could be a sponge.

 

[Anonymous]

Without a pic I would guess a cowrie(first guess) or nudibranch.

http://www.melevsreef.com/id/snails.html