periwickle snails?????

[heater15]

 anybody have any luck with these in your reefs or any experiences with them,ive read on other forums people say there doing well ....

[omarshabaz]

Not too sure, but they are extremely cheap on ebay...

[Cbellehumeur]

Appartently they crawling out at night and back in during the day and "the periwinkles are among the very small number of sea creatures which breathe air" So i'm not sure if they need to get out of the water once in awhile.

In Southern United States, all freshwater snails are also known as periwinkles so be careful if you buy them.

[heater15]

anybody else ,any info

[jimskoi]

Theres a pretty good article here on collecting from that area and what works in our tanks.
Local Collecting in the Tri State Area - Manhattan Reefs

They do mention the temp issue:
"The conditions of our local environment can be very different from those found in the tropical seas where most of our aquarium fish and corals originate. The issue of temperature is perhaps the most obvious difference, but one that needs to be addressed first and foremost. The temperature of our local environment ranges from somewhere around freezing in the winter to highs that resemble tropical waters in the summer (mainly tide-pools). The most important factor to understand is that the variable temperature is very important for our local fish and other marine organisms. Just because tide-pools can reach temperatures in excess of 80 degrees Fahrenheit, doesn't mean that all marine organisms found in them will thrive long term in our tropical reef aquaria as these high temperatures are the rare seasonal exception and not the yearly average. Just because an animal can tolerate a physical parameter for a limited amount of time does not always indicate it can thrive under those conditions long term. The truth is that with a few exceptions, most of our local species require cooler waters for prolonged health."

and the Periwinkle specifically:
"The Periwinkle Littorina littorea mainly eats macro algae so it becomes difficult to feed properly. There are conflicting reports on whether these snails can tolerate the warmer temperatures of our marine aquariums and are best avoided."