Filter question

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Yes and no. It's difficult but the only real way to overfilter your tank is with too much water flow. If the fish are getting blasted around your tank from the flow or are all hiding in one corner then there is too much.
 
I ask because currently I have in my 16 gallon tank 12-15 guppy fry. The filter I am using is an AC20. I checked on aq advisor and it said I need more filtration.
I bought a small filter, aqua jet 300 which is 306l/h. I hope that will do
 
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