A strange new species! [Asok]

Zeraphem:

Zeraphem are a large, exceedingly rare sentient species which evolved from gigantic filter-feeding, fresh water bivalves on the planet Cōōlsari. They stand between 2.5 to 3 meters tall, with the majority of their bodies being inside of a drab gray shell, which hinges between the lower two of their five appendages, which could be construed as stubby, legless two-toed feet when extended. The middle two appendages are much longer fingerless tentacles, which are more than capable of even minute control. Each of these tentacles is approximately 3 meters in length when fully extended, though it is rare to see a Zeraphem fully extended as all of it's appendages fold neatly into its shell when it is startled, sleeping, unconscious, or just not moving. The last of its appendages is a thick muscular eye stalk, which ends in a single small eye. While Zeraphem shells are always the same drab gray, the flesh which resides inside can be anywhere from common pink to lime green to in very rare occasions, white. As it breathes fresh water and also derives its food source from fresh water, a Zeraphem is unable to leave its source of fresh water, though this has, in at least one case been overcome with the use of a self contained environmental suit, build specifically for the Zeraphem.

Any help with this would be MUCH appreciated!

Thanks for taking a look...