Got my Tunze 9002, inTank media rack & upgraded cup yesterday. It seem that the upgraded cup has a longer neck than the Tunze stock cup which makes the cup flop around. Is this normal or am i doing something wrong?
The tube should fit cleanly down in the skimmer, and the bottom of the cup should rest evenly on the round rim of the skimmer. It's a loose fit and will move if bumped, but should sit level.
the in tank skimmer cup is a bit heavier than the standard one,ive found putting a chamfer on the inside of the neck base with some sandpaper makes it a lot more secure