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We always have Zebra Nerites in stock. At a price noone can beat.

http://www.invertzfactory.com

The Zebra Nerites we get don't lay a lot of eggs. Olive Nerites seem to lay much more eggs.

--Nikolay
 

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Here's what the Olive nerites did in my tank:

https://flic.kr/p/104658166
The algae on the rocks where the encrusting kind. Nothing can remove them (other than tweaking the water chemistry). If the Olive nerites wandered on a rock they'd scrape it clean as on the picture above. But it was a very random process - they didn't specifically head for the algae.

I don't have observations on how the Zebra neritinas do against algae. In any case the shell of the Zebra is much more attractive than the Olive nerite.

--Nikolay
 
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