yes cause the eden 501 is not like those type of huge eheim filters we all have hence when putting it on the table pump doesnt have to work so hard or even better abit higher we get leverage hence the flow rate out of the pump can be maintained at a reasonable speed.
when you put on the floor the pump has to work doubly hard to pump water up against gravity hence flowrate experiences a significant decrease as the pump rotor speed has a fixed upper limit.
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