I hate noise but love my aquarium. It seams most commercial overflows the outside box is lower than the inside box. The water falling over the weir will cause noise in my experience. This is going on a 55 gallon tank so it doesn't need a ton of flow but if my calculations are correct it should be able to flow around 900gph. I added in a second layer of acrylic to the outside box for a spacer so it can come to the top of the rim. I hope to get it installed this weekend. I will post pics if it works.
