I prefer over-filtering and I don't think 2 HOBs will cut it for a few good sized predators. I'm setting up my other 125 now for my 5 monos and silver aro and its going to have a 30 gallon W/D, an Fx5, an AC110, 2 AC power heads, and I'm considering looking into adding an emperor 400 too.
Don't skimp on the filtration. You'll regret it later.
