I agree. Some people will tell you that nothing will work and you need all new stuff. Is the substrate crushed coral of some sort? I assume if they are Africans then it probably is. That may be the only thing you may want to replace or add more of, simply because over the years a lot of it has probably broken down and dissolved. You will need to add fresh coral gravel/sand to get the nice buffering benefits.
As for the price that sounds like a great deal as a 125 gallon (tank only) is about $300 new.