Marconis
Aquarium Advice Addict
I bought an AC30 for my new 20g, and it is dead silent compared to my AC 50 on my 46g. It didn't bother me until I realized how quiet I could get it. I took out the impeller on the AC50, and found that the magnet was wobbly on the impeller. Should it be like this? Could this be the reason for the noise? The noise is like a rattling.