Interesting ideas, thanks guys.

Right now its just got the standard fluval outlet which pressurises it quite alot, ive actually thought maybe of splitting the flow with a T piece, I have quite a few dead spots around.. such is the way of annoying 4 foot, 12 inch wide tanks.

Do you think a spray bar might be better, maybe aligned from one end pointing to the other?

edit: just been looking at plumbing fittings, lots of sizes, my fluval hose is about 20mm(ish). Do you glue them into the fittings? (like the T peices etc)