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Discussion Starter #1
I have an Eheim 2217 in my 1st tank and an Eheim 2236 in my 2nd tank (both are 40 gallon tanks).

Having recently moved from 10 gallon tanks, I'm not sure if a filter, no matter how powerful it is, can circulate water in the corners because of a single intake tube fixed at one spot.

So, I'm interested in buying Koralia powerheads but wonder if there is any way to roughly tell if a tank needs more water currents. Thanks in advance.
 
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