Christy,
I use both nassarius and ceriths in my nanos. Make sure you get the small nassarius. Both snails do well as the stay small <1". the ceriths spend alot of time on the glass and the nassauis plow thru the sand. I also have a crew of 5 left handed hermit (the little guys), 3 nassaruis and 3 ceriths in a slightly less than 9 gallon tank. I am thinking of doubling those numbers. I would start small just a couple of each and and more as needed to get the job done. I also use a pair of two spot gobies to keep the sand moving. They are a great sand sifter and max out at <2". There are several gobies you can use to stir the sand that stay within most nano size limits.
HTH
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My opinions are exactly that - MINE, heed or discard as you will.
I would be alot nicer if people were smarter.
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