Astrea is a cone shaped snail that in my experiance tend to fall over and die thay cant upright them selfs and will try till ther exsosted to the paint of death vary good at mundhing algae the mexican turbo snail i a more tipical snail shape and about 2x the size dos not fall over and die but has the same tast for munching algae i recomend the turbo snail hope this helps