koralia powerheads in a 40g

[vmartino]

I have a 40gallon tall set up. I want to get some of the koralia powerheads. What size and how many would you guys reccomend for this tank?

 

[rtzx9r]

I have a 60 and just put in two #3 Koralia's. Very happy with them, and they seem to be perfect for the size tank. I would presume two #2's would be good.