Petsmart replaced the ac50 even though it was past 60 days. Guess they are not half bad after all. I ended up getting an AC70, and sounds like the impeller is hitting something every once in a while, but nothing compared to the rattle the ac50 had.
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a 29 gallon high tech planted Chasing Red
, a 20 long low tech, and a 75 gallon salty adventure