Ring cowries

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I have read about these. Now they are available at J & L.

What type of algae do they eat, do they just eat algae or will they also clean up detritus/leftover food etc?

I have 3 turbo snails, 8 Astrea snails, 2 ceriths and 2 nassarius snails as well as a yellow tang and a Hippo tang for algae control, I have no problems with algae but a few small areas of algae here and there.

I'd like to get the ring cowries for diversity and to help in the overall cleanup, any feedback on these animals? Also what has people's experience been with receiving snails etc by air freight, do they usually survive or not?