The Marineland/ Perfecto 120 - 4x2x2 maybe the worst designed tank on the planet - 3/8" glass all around no tempered glass bottom - they crack like no other w/ freshwater can only imagine how horrible it would be with SW. Hope you choose any other tank than this one.
FW to SW
- Thread starter JASamper
- Start date
An article that might help you out a bit. 
http://www.oscarfish.com/article-home/fish/157-converting-from-freshwater-to-saltwater.html
http://www.oscarfish.com/article-home/fish/157-converting-from-freshwater-to-saltwater.html
