I don't believe that any sponge filter is rated for a 125 gallon tank. You must mean 125 gal/hr powerhead flow. Personally, I would be running two power filters like the penguin or aqua clears.
Fear is a path to the Dark Side: Fear leads to Anger, Anger leads to Hate, and Hate leads to Suffering.
~ Master Yoda, a long time ago in a galaxy far, far away.