I have a new tank and Im not sure about the filter

Mazzy7

New Fish
Jul 10, 2009
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#1
I have bought a 2nd hand tank. It has a filter built into the lid and Im not sure all the bits are there. There seems to be no sort of filter at all, the water goes along a trough and turns a little wheel with some filtration on it....is this it or is something else supposed to go in the lid?

Thank you kindly.

Amanda