I have recently switched from All for Reef to Aquaforest 1,2,3 and was looking for advice on dosing pumps. I currently have one Ecotech Versa and was wondering if I should buy 2 versas or buy a RedSea Reefdose 4. Price wise its almost the same, but with the redsea I would get one more dosing pump. Is there a big difference between the two pumps?