I also just set up a XP3 on my new 125. I've done alot of research on this board about it and knew about the spraybar noise. I figured I'd set it up and check it out first before drilling it. I had moved the tank contents of a 55 over to the 125, so the water was pretty cloudy. Sure enough, after about 12 hours it started whistling. I cleaned the filter, and about 12 hours later, same thing....noise. So I removed some of the sponges - 2 30's and 2 20's are not really necessary anyway. 24 hours later...noise. Ok, fine, drill time. Now, the pieces that have the lips and clips mentioned above hold great, however, if you have to take it apart....beware. I broke my fingernails and then the clips. I finally got the spraybar off, drilled it, and reinstalled it. Noise gone 48 hours and counting. After I "fixed" the spraybar, I went online to BigAlsOnline to order a spraybar that I will drill first and install second. BigAlsOnline only lists the spraybar that comes in pieces, and I want the one-piece one that comes with the new XP3. Called Aquarium Pharmicuiticals customer support and they directed me to Renapumps.com, and they have everything for the Filstar there. So I ordered two because they were only 3 dollars each and I've already broke one. Can't hurt to have a spare.