Fluval rattling

[pesky_fish]

I've got a Fluval 404 that is a year and a half old, and has recently gotten a consistent rattle to it.

I've double checked to make sure the impeller assembly is clean, and that there isnt air trapped, but I still can't get rid of it. Tried tipping the canister sideways at a 45 degree angle and otherwise moving it around to try to eliminate it, but that didnt help either.

I ran CO2 into it for a year through the intake, but havent the past few months. I'm thinking maybe the impeller is just going bad on me, or could this be something else? Visually the impeller looks ok, but maybe it is non-visually weakened? Thanks for any opinions. I was planning on ordering a new impeller, but I'd hate to get it and find out that wasn't the cause. :o

[125gJoe]

Maybe the impeller is bad..

Try powering it off and on a few times. I know that settled down a noisy AquaClear I used to have. I have a Fluval 404 for about 2 years and it's real quiet. Tiny snails did cause some noise awhile back when I found them in the impeller housing.

[zzyzx]

I ran my Fluval 304 dry for about 15 minutes by accident. The white collar in the impeller assembly became oblong and required me to replace the impeller assembly to stop the rattling.

I'd clean the impeller and the impeller housing well and visually inspect the impeller assemby for damage.