Just upgraded to a 75 and got an allglass, predrilled with plumbing. Got a 30 gal "tupperware" sump and am working on DYI'ing it. Question is I have put some foam padding on the stand to quiet the sump drainage sounds, but have heard that you can drill a few holes in the stand pipe drain to quiet the gurgling and waterfall sounds some. 1) is it true, 2) are their any drawbacks to doing it. What about waterlevel in the overflow, won't it drop?