125 g long convert to breeder tank !

[sfutchko]

I am going to start a new project, I have my 180 running with no issues and I am happy, Now I am looking at my old 125 gallon and want to do something with it. I am thinking of creating a breeder tank and sectioning off maybe 4 cubes inside the 125... I just want to see everyone's OP or if they have any information or if there is something better I should do! Let me know.