Overflow Articles

[bladeruner143]

Does anyone know any good articles on the basics of overflows (ie what they do, why to have them, is it better to have 2 rather than one etc)?

 

[sruiz]

they skim the top of the water surface(where most of the scum is), i would say two is better than one, it give you it allowes you to drain more water quicker from your tank to your sump, you might need a bigger pump by using two over flows.