How many snails/crabs do you recommend?

Do you have a basic formula for calculating how many Astrea, Cerith, blue leg and Emerald crabs to buy?

I think I've had more than a few Cerith's in the last year and I have but on Turbo and one (very large) Astrea.

Algae isn't necessarily a problem, but I want to ensure that I keep things under control

(I do have a cyno problem, but that can't be fixed by these guys).

Thanks
Kurt
 
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