Is internal filter's propel noise bad for fish?

[abudakos]

Hi all,

I have a 20 lt aquarium with an internal power filter (eheim 2010). The filter's power head makes a noise which is rather subtle from ''outside'' than ''inside''. In other words, if I put my ear on the glass, the noise seems pretty strong. Do you guys think this is bad for fish?
This tank is currently under fishless cycling and I am planning to put in a male betta and a pair of peppered corys.

 

[Lateral Line]

I don't think your Eheim should be rattling. I would check the impellor if I were you.

 

[Alien Anna]

Definitely check the impeller. Last time I had a problem like this, a snail had got inside it!