MrKite24
New member
If you're going with the CPR, I would also recommend building a durso style top in the overflow box on the outside of the tank. It makes the overflow almost silent. I would always get a flushing and gurgling sound from the water falling into the outside box and down the drain. With the durso style drain the water doesn't fall as far and the sound is trapped under the water so you don't hear it.