looking at the sump picture...
on the far right are two hoses.. one is white striped in front of the black hose behind it...
the striped / flexible hose is the drain line.. it lets the water drain from the tank into the sump...
Inside teh sump is a pump, (hard to see), but it pumps water up to the tank... as it pumps water, the water will 'over flow' into a drain, and then back to the sump...
The white striped hose, goes from teh far right to the far left.. and it actually drains into a 'filter sock', bascially a bag of cloth that 'filters out the chunks'... (used instead of filter pads)
In the middle of the sump is a protein skimmer.. it has a blue tube/pipe that is used to control the water level inside the skimmer
On the far right of the sump, in front of the white striped hose, is a media reactor.. It is hanging on the sump.. (it is a HANG ON type of device) it can be mounted in a sump.. or a tank...
On top of the sump, on teh acrylic sheet, is a dosing jug.. used for Calcium and ALK suppliments
hth
Holy Cow! That is just amazing! I am still trying to understand what all the sump and extra hoses are for. WOW WOW WOW Beautiful!!!!!