Would kinda be a waste if you are going fw. Great deal for salt, but you shouldn't have a big problem getting rid of the live rock and skimmer and stuff. I'd do another pump if i were making it freshwater, but you should be ahead of the game after selling all the salt stuff
Around here in florida 125 gallons with that would run $1000+ used on CL....that would be a steal for these parts. Just get it and sell off what you don't need for FW or save it for a future project