They are not sundail sanils , they are actually very good grazers , they will also muiltiply like crazy.
[FONT=Times New Roman, Times, serif]The Virgin Nerite, Neritina Vittina virginea[/FONT]
[FONT=Times New Roman, Times, serif] Virgin nerites occur in the Caribbean, Gulf of Mexico including Texas, Florida, and the South Atlantic. The color and pattern in
Neritina Vittina virginea is extremely variable. Colors include purple, red, orange, gray, black, white and patterns with checkers, triangles, or stripes. There are numerous Neritina species found in coastal habitats in tropical and temperate locations all over the world, and many of them are superficially identical to
N. virginea.
Neritina communis (Quoy & Gaimard, 1832), now known as
Vittina waigiensis (Lesson, 1831) from the Philippines and western Pacific is even more colorful than the Virgin Nerite and just as variable in pattern. The Virgin nerite occurs at the low tide mark on mudflats and
Halodule spp. seagrass beds, often in areas with brackish water. It also occurs in tidepools along with the similar looking
Puperita pupa tristis. The operculum in the Virgin nerite is darker than the operculum in
Puperita, otherwise they can be difficult to distinguish. The diet and husbandry requirements in captivity are the same as for
Puperita. The life span in captivity is also typically about one year. Other species in the genus
Neritina may live for longer periods of time.
Vittina luteofasciata, from the central American Pacific coast lives at least three years in captivity (pers. obs.). It has recently been imported to the USA for the aquarium trade.[/FONT]
http://www.advancedaquarist.com/issues/sept2003/invert.htm
http://home2.pacific.net.ph/~sweetyummy42/index.html you can also view some others here, click nfo links on the left side , then click on the snails , great site with great info