Fluval C3 vs. C4

[Anna94]

I bought a Fluval C3, but I have 2 concerns: 1. When I first set it up it made a rattling noise so I lubed the impeller and impeller shaft with Vaseline and that helped a little bit, but it still makes an audible hum and very slight rattling noise and 2. I'm wondering if it will be enough filtration for a 29 gallon tall with 22 fish (cardinal tetras, lemon tetras, Celebes rainbows or green fire tetras, and otocinclus'). Is the C4 quieter than the C3, will the noise coming from my C3 eventually go away?

 

[Delapool]

Did you have any luck sorting out?

 

[Anna94]

Did you have any luck sorting out?

Yea, I'm just gonna stick with the C3