Can't believe i never set these up before! Installed them on my 400g and my 150g and WOW what a difference. my 150g was the loudest since it's 30" tall and the overflow goes all the way to the bottom. sounded like niagara falls 24hrs a day in my living room. now, it doesnt even seem like i have any filtration running.
point i'm trying to make, if you have an overflow/sump YOU NEED durso standpipes. $5 and 15min to make
http://www.dursostandpipes.com/

point i'm trying to make, if you have an overflow/sump YOU NEED durso standpipes. $5 and 15min to make
http://www.dursostandpipes.com/
