Reef Crest 100 Micron Filter Sock (7 Inch) Test Kits It can be distinguished by

It can be distinguished by its longer snout

but is most commonly free living on soft bottoms

The Australia variety is usually a much nicer color than from other areas

Manufacturer model: I-552

Reef Crest 100 Micron Filter Sock (7 Inch) Test Kits It can be distinguished byReef Crest 100 Micron Filter Sock (7 Inch) The Reef Crest 100 Micron Filter Sock (7 Inch) is a washable felt aquarium filter sock for finer mechanical filtration and water polishing in compatible sump systems. 7 Inch 100 Micron Sock for Finer Water Polishing The 100 micron felt captures smaller suspended particles than a typical 200 micron sock, making it useful when the aquarium needs clearer water, extra polishing after maintenance or improved