Cryogenic coral collection containment

Animal sperm banks have always held a special place in my heart, that is why I love this article I found while perusing the intertubes about an Australian zoo that plans on collecting corals to cryogenically freeze them for re-population if the species becomes extinct or endangered.   Sounds promising; article after the break   http://www.theage.com.au/national/education/coral-future-may-be-in-the-bank-20110321-1c3iv.html