well, if you are getting problems in this frequency on a regular basis, then you do need room correction, or RMC software.

as it`s 100hz there`s no real easy way to deal with this.
For a start are your monitors close to the wall? This may cause problems.
also if your sitting position is close to the dead centre of the room (and in most home studios, this is where you end up) then this will also be possibly the worst place to be.
you need to identify which areas need damping, so move around the room playing sines around the problem frequency area (when doing this, do it for each speaker separately, and then with both on). you should be able to get an idea of roughly which side of the room is the main reflector problem for the standing waves.
It may be your corners need bass traps, but you also might need to absorb bass energy on some flat walls as well.

There`s a really good website where you can download software, build a plan of your room and then send it to you, and they can advise on problem areas etc, but I forget the link.
I`ll try to find it.


However as an aside, if you listen to loads of music through your speakers (preferably a good mix of music, not just techno, which is pretty badly produced on average), eventually your ears will be able to tune out this problem anyway.