Can you identify this for me please?

[Gribbles]

It has 2 antenna that it apparently can retract and was able to shoot some white substance out of it.

 

[Jekyl]

Stomatella, pretty sure. Google for more images and verification

 

[Gribbles]

Stomatella, pretty sure. Google for more images and verification

I think you are right, thanks! Pretty cool looking thing!

 

[Tired]

Yep, stomatella snail. The white substance was probably it attempting to spawn, releasing either sperm or eggs into the water. These lil guys breed in aquaria, so if you have more than one, you might be about to have a bunch. Fortunately, that's a good thing.