I know that you figured it out and have the filter running
But when it comes time to do the regular maintenance theres one thing that you can do that will make things easier to restart the filter again ...
Right beside the lock lever that locks the intake and out take hoses to the canister is the flow control valve before you unplug the filter shutt this valve off so that the water wont escape the hoses then unplug the power ...After you have cleaned the canister and your ready to restart things make sure that the canister is completely full of water , move the canister around from side to side making sure that all the trapped air escapes then top off with water ...Reconnect hoses to the canister then make sure to start the power first before turning the flow control switch on that way the pump has a head start with the pumping action then open the flow control ....Hopefully if you have done these things right your pump should be running fine now ..If for some reason that the hoses drain make sure that they are full before starting the pump again , you need this so that the pump has a head start and isnt working extra hard to get things running again ....I know this from first hand experience as i have the older version Fluvals and also the new version Fluval canisters ...Hopefully this will help