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how to quite an aquaclear hob?

2362 Views 6 Replies 5 Participants Last post by  BrianNFlint
ok i have 2 ac50s(aka 300s) anyways 1 is super loud and 1 is not.. yesterday i went and tore both apart to see if anything was different, there not, both impelers are the same too, there both perfect. my question is why is 1 loud when the others not...

also if it makes a difference the loud one has a hard time starting after the power has been shut off.
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actually i took the lid off allready, it heppened but not enough...

no sand, no substrate, the impeller part looks perfect, i pulled the quite one out to compair them... id prefer not to do that again... it took me a hour to start the noisey one again... :(
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