How much flow?

I want to get another powerhead to increase flow in my 29gallon long...
36 x 12 x 16. I already have an aquaclear 70 in there. Im looking at koralia, and am wondering if I should get a #2 or #3. Any suggestions?

 

I would get 2 of the 2s for a 36inch tank. I'm afraid the aquaclear really isn't contributing the flow

J

 

An aquaclear 70 puts out 300 gph, you get some nice surface flow from that. As far as wavemaking and currents I too would go with 2 of the #2's. That way you will be less likey to have dead spots

 

Make sure you protect the bottom of the Aquaclear 70. I don't think they come with a good defused intake grill. I used to have them in my tank instead of Koralia 3s. I had a Flame Angel get sucked up against the intake. Unfortunately I didn't catch it in time and lost him. Stupid me didn't learn my lesson and is also sucked up my Hepatus tang. I caught it in time and was able to pry him out once I turned the pump off. He had grill lines on his body for about a week and a few white spots as a result. He's doing great today. The Aquaclear 70s have been demoted to water mixing and my protein skimmer. Definitely my stupidest mistake so far with my reef tank.