Not to confuse matters I bought some top crown snails which look like your photo as well and the top crown snails helped with the algae as my 90g cycled. I have had them work on cyano and they also took care of a small patch of bryopsis I had as well. Texas Tropical calls them Top Crown but B & B calls them Tequila Turbo. Either way, their top crown is silvery in color and they are huge and fast workers!