I got one in my tank, its 1/2'' size and white color..i found it traped in the floating riccia plant, i can see it pushing the water out of its body just like clams.
i have no idea how i got it though...this is a picture from google images,: http://gwsphotos.com/images/473.JPG
i have no idea how i got it though...this is a picture from google images,: http://gwsphotos.com/images/473.JPG