I have had excellent results w/ 2 mithrax crabs in my 55. You would need considerably more. How big is the outbreak? I think the only issue with the valonia is asthetics.
Green Mithrax crabs (AKA Emerald Crabs, Mithrax sculptus) can be bought mail order from many different places. See these links:
http://www.premiumaquatics.com/Merchant2/merchant.mv?Screen=PROD&Store_Code=PA&Product_Code=L-EMERALD&Category_Code=Crabs
http://www.ffexpress.com/setinverts.htm
Ernie
Green Mithrax crabs (AKA Emerald Crabs, Mithrax sculptus) can be bought mail order from many different places. See these links:
http://www.premiumaquatics.com/Merchant2/merchant.mv?Screen=PROD&Store_Code=PA&Product_Code=L-EMERALD&Category_Code=Crabs
http://www.ffexpress.com/setinverts.htm
Ernie