I am currently thinking of building a sump for my 55 gallon FOWLR tank. How in the hell do you do it and what do I need?
I have never had one and would like to know more about them. how do they work?
What size do i need? Plumbing? Is it better to stick with my current filtrarion which is to HOB filters. 
I have never had one and would like to know more about them. how do they work? What size do i need? Plumbing? Is it better to stick with my current filtrarion which is to HOB filters. 
