Difference between 1.5" and 2" drain in overflow

[christyf5]

Yeah, if I don't have a cap on it its disgustingly loud. With the cap on, it surges. So I drilled a bunch of holes in the cap so its not so loud and doesn't surge. Its still pretty loud though.

I was thinking of maybe putting a jog in the pipe going from the bottom of the tank to the sump like so: _|
.................................................. .................................................. ....................................| (ignore the dots, stupid thing wouldn't accept spaces to get it there)


but then that just slows down the water in the overflow even more.

I'm currently running a stockman in my 90gal, it's nice and silent but theres a lot of algae growing in my overflow and it constantly clogs the holes of the stockman.