I did a bit of a redesign to my 20 Gallon Tank. Having used my tank for little over a year, changed a couple things. After fishing for 4-5 hours, the water splashing from the Aerator head become annoying (and made me wanna pee all the time :embarassed.. Also, Im not sure how much Air was actually making it into the water. First I added A Venturi for Air infusion. I took a threaded 1/2" plug and noticed it fit perfectly into a 3/4" pipe. I then drilled out the middle with a 3/8 spade bit..