if your nassarius snails wont go on the sand, it is possible they are actually a whelk. whelks can actually be a predatory problem and are often misidentified by an LFS. could you post a picture of the "nassarius snail"?
the rest of those snails will usually stick to the glass or rock work.
in a tank that size i think nassarius snails are the best thing you could put in the sand bed, they should be turning it over all the time.
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120S RR tank with 60G basement sump / fuge
Return Pump: Little Giant 4-MDQX SC
Water Movement: Seio 1500, (2) Hydor Koralia 4's
Lighting: 400W SE MH with 14K Aqua Connect
Skimmer: Euro-Reef RS250 with gate valve
Other: RODI, RDSB, PO4 / AC reactor
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