So i have the whole assembly out of the tank... but i cant figure out how to get the lower half of the white bucket off, there are 3 tabs that i press in and the bucket starts to slide apart but then gets stuck on some black peice with a star bit on it, do I need to take that off? any help on how to get the bucket apart?

 

Disconnect the piece with the 2 purple wires. It might be holding them together.