Can small filter be added to tank

Lamie

Fish Crazy
Joined
Oct 5, 2021
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Location
New Zealand
I have a small filter from an old 20litre tank that I want put into help with filtration. It has been sitting for a while- maybe a year since we had tadpoles in it. It is very dry now. Is it ok to put in the tank just as it is?
 

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