None... the turbos like film algae, and some have been reported to eat other kinds of "turf algae". None, from what I have learned, eat coraline. Again, they are in to "micro" algae. Mine will also eat nori and although they don't touch the Caulerpa serrulata, they do like prolifera.
Thanks! What are your thoughts on how many to add to a 70 gal. From all I have heard it about 1 per 5 gal. This seems high to me as I have other smaller varieties as well.
Well... I use about 1 for every 5 gallons..and I have about 1 nassarius for every two gallons. I also have 1 astrea per 5 gallons, and a handfull of ceriths... finally, I have about a gazillion collonista snails in my system that came as hitch hikers.
Basically, if there is a food source (algae for most, meaty foods as well for the nassarius) then they will thrive. If you have a new tank, with little algae, you may not be able to keep a lot of snails...
I add more snails (about a dozen or so) every year as I tend to lose some to the hermit crabs and other natural causes.
I think there are some better snails than mexican turbos (typically cold water snails not suited for reef tank temps). Putting appropriate warm water snails in your tank that are capable of breeding help keep your tank clean and there is no need to replace any, you can even export some to other reefers!
Unfortunately I'm about to disappear until after Christmas. I'll try to reply in more detail after Christmas.
MY turbos are really good for hair algea, I have 3 of them about golfball size! I keep 10 snails 2 big golf ball ones and 8 med-sm ones in a 10g. They work really well on the glass and they will not clean rocks IME
The adding of Mexican turbos 
to TR.
icon under their name to add to their reputation. 
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