i think it's up to you. If you think the flow is lacking then by all means run them both. I have mine set on a wavemaker and they alternate every like 5 seconds so I don't loose too much flow. Can you set the timer so it is closer together?
180g Reef - 60g Rimless Reef -90G FOWLR- 125g Malawi Cichlids- 40b REEF- 34g Fresh Planted-working on- 20L FOWLR- working on
I have a mix of many different saltwater fish amongst my tanks, but I love my Tangs most of all.