Buongiorno -
I have only done SCUBA diving off the Tuscan coast but, I can give you the name of the shop I used in Livorno. They have an English site and they should be able to offer more information and equipment:
http://www.accademiablu.net/index_eng.php
I also know that Livorno is not the "prettiest" spot to be doing some diving - the island of Giglio and Elba are really the best with the national reserves and more shallow waters.
Buon Viaggio.
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