On the little 30g tank I have I have a whisper 40. It sucks and is loud but keeps the tank crystal clear for not being very powerful. But what I've found out is when I change out the filter I put the new filter in place and take the dirty old filter and keep it behind the new one for a couple days. I feel that this eliminates that cloudy water period. I think it allows the beneficial bacteria that accumulated on the old filter to migrate to the new filter, thus making the new filter more effective faster. I could be crazy, and it could all be in my head haha.
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