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Creating decent circulation

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I've just added a Bio Pro 1800uv to my 450 litre 4x2 , complementing a cheap 2000lph internal filter.

The filter and inflow side of the canister are in the back right.

Bother the filter and canister out put to (separate) spray bars.

As a result I think I'm getting a slight dead spot in the tank in the back left.

Should I take the spray bar off one and have it point it's outflow from top back right to top back left?

In assuming that i'd be better using the internal for creating flow?

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