A friend of mine gave me his fluval 304 and its missing a few parts. The parts its missing would be the aqua stop valve, hosing, intake and the output nozzle. I could only find spare parts for the 305 though. Would the 305 parts work on the 304? and also i managed to open the canister (had a hard time) but now i cant seem to be able to close it. Any advice on how to close it?