Ok i just bought a fx5 and set it up on my 180 gal fresh water setup new tank setup. the flow is very weak and the output is unnoticeable. what i used in the three media basket was carbon in the first , biomax in the second and two filter pads in the third at first, there was very little flow so i thought maybe i put to much media in so i took it apart and took some the biomax out and then took the carbon out and replaced it with a fine filter pad in the first biomax in the second and a coarse filter pad in the third and put it back together still no better. I recheck everything the houses the lid i dont get while it isnt working properly can somebody help me out