
The answer to this question can be both yes and no. A second-hand filter of any type can effectively contribute to the much faster cycling of the aquarium because it is most likely already colonized with the beneficial bacteria sought. The temptation to resort to this solution is all the more significant as the purchase price of a new external canister filter is substantial; it is money you would probably be happy to invest in something else. But, on the other hand, any second-hand filter could transmit microbes in your newly set aquarium that could make your fish sick.
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