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You are lucky to have discovered the leak early to prevent further damage. There were accidents reported of leaky canister that drained the tank over night. There are no safe canisters as long as external hoses, clamps and O ring are used, and any break can turn into a fountain. HOBs are the safest because there is no external plumbing,
 

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True, 90% leaks are due to human error, but if you can eliminate opportunities for human error, you reduce chance of leak by 90%. If the filter has no external hoses, clamps and seal, there is no opportunities for human error or material failure to leak. Internal filters and HOBs do not have external plumbing and can’t leak, with the exception of Fluval AC . AC is designed uniquely in that you have to unscrew the motor to access and clean the impeller. The O ring seal will eventually fail with repeated unscrewing or aging similar to canister seals. Another flaw of AC is that a clogged up foam can pop up pushing out the cover and potential drip over the top.
 
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