Join Date: Dec 2011
Location: San Antonio, Texas
Personally I wouldn't do a SW setup with a tank that large without a sump but that's just my experience. People certainly do it and 125 gallons is a nice size for a SW tank. I assume you have fish keeping experience. If you don't or it's very limited I would go with FW. No matter what you do you might want to consider painting or blacking out in some way your back glass before you put water in it. And one more thought no matter which way you go....quarantine tank! Good luck no matter what you decide.