Tunze 6055 making a knocking sound on wave settings

[windcoast reefs]

Originally Posted by Delphinus

Watch the impeller carefully, can you see if it's stuttering?

I've had mine stutter before on a couple occasions and it seems to be the power supply. Best way to confirm this is if you have a second power supply and swap it out and see if the problem persists.

I'll take a look when I get home but it seemed to be running fine, I'll switch out power supplies and see if that helps