From personal experience... fill the durned canister up before buttoning up the lid. That way you only have the hoses to fill. Now...as to hoses... I haven't owned a Filstar, though they seem to be easy to find locally (wonder why?) so I have no idea about how the intakes and outlets are but... the only way I could get my fluval primed was to dunk the entire hose in the tank and even then, I usually ended up with an airbubble at the elbow. I've never had any problems getting the hoses primed with the 2026.
My mind is aglow with trancient nodes of thought, careening through a cosmic vapor of invention - Hedley Lamar