If you look on the underside of the large snail you can see two white snails. Are these pyramid snails? If so, what can I do to get rid of them? Thanks.
Definitely. Mechanical removal and death by crushing. Wrasses have eradicated them for me in the past although I had an infestation at one point on a rather sizeable clam collection. Shouldn’t be too big of a deal if you don’t have clams.