Yes and no. The pumps can run with no controller and you can adjust the speed, if you want to pulse them or alternate them, you will need a controller.
They would be on the small side, about 1/3rd less flow, it could work for a more basic reef with polyps, mushrooms and soft corals, but it would be underpowered for many corals. I think the most I would do with 6040's is a 65.
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