It is true that they are beautiful, I have of them 4 for a vat
of 200litres, it is largely sufficient, they débarrasent the plants of
their algae without the abimer and moreover they do not reproduce in
captivity, therefore not risk of invasion!



I guess it doesn't answer your question, though

this :Zebra Neritina is a very beautiful species. I have bred a pair
of them and their kids now roam my tank. They are very cute when they
move on my tank wall. Their red colour will fade if not fed for a week
or two. We should take good care of them.

I seen this post )))
THX

from he http://www.aquahobby.com/gallery/e_Neritina_zebra.php

Might be you could contact that site and get some direct information

I willl try !!!