No worries Clive, I will answer as best as I can
The fx6 has one inlet tube which is telescopic, meaning that it can be extended or retracted depending on how tall your tank is. I have sand as my substrate so in order to not suck up lots of sand into the filter, the inlet is about 2 inches above the surface of the substrate.
The outlets are one pipe that branch off into two outlet tubes which sit just under the surface of the water, on the opposite end of the tank to the inlet tube. They have little things that you put on the ends so you can direct the flow of the water in two different directions. One of mine is pointed straight across the back wall of the tank and the other is pointed diagonally across the tank - sorry of this is hard to follow, its difficult to explain
The fx6 hoses are big - more than an inch across from memory. They are also ribbed and come with brackets so that you can secure them to the sides of the tank.
In terms of setup, I have the inlet of the fx6 sitting next to the outlet of the 305 at one end, and the outlets of the fx6 next to the inlet of the 305 at the other end - 1 inlet and 1 outlet at both ends of the tank.
I also have a 35watt maxspect gyre generator (similar to a wave maker, but better!) - its job is to make sure that there are no dead spots in the tank. Because I have mbunas, my tank is filed with rocks, caves etc - the maxspect makes sure that water flows throughout the entire tank and forces waste towards the filter inlets.
It does take up a lot of space (300watt heater is there too) so I had to have my glass sliding lids cut to fit everything in.
I hope this helps