Sump options

[HappyHooligan]

I have a 90g fowler with a HOB skimmer.
The tank is in a classroom and I'd like to install a sump to help quiet the noise and also increase water volume.
The tank has been up about a year now and I have absolutly no idea how to accomplish this. All I know is that the tank is not drilled and I have 18" by 48" of enclosed space beneath the tank.
Are there any "sumps for dummies" links or resources to get started?

 

[Zer0]

Well since the tank already has inhabitants your going to have to go with a HOB overflow box. Since i'm pretty sure you can't drill the tank with things inside of it lol.

The closest to the "sump for dummies" thing, will be this site:
Melevsreef.com - What is a Sump?

That is the site that is helping me build my sump right now.