How many power heads?

Right now I have one koralia 2 in my 65 gallon and was wondering should I put another koralia 2 in there?

 

i would put a 2 or 3. yes get another one to make some random flow patterns.

 

yeah... i had two k4's in my 50G

 

ya in my 55g i had 2 #2's and a #3 and i thought i could still use more

 

Alright looks like I will be purchasing another powerhead today. Thanks everyone

 

get a #3. your tank will be happy you did

 

how should I have them positioned? I have the lone powerhead facing towards the surface to agitate the water for better gas exchange. I was wondering do I need to break up the suface if I have a corner overflow?

 

If you are buying Koralias today go for the new Evolution series. They are smaller, way more energy efficient, quieter and best of all are controller friendly so can be switched on and off repeatedly with no ill effects unlike the regular K series.
I switched from two K4's to two Evo 1400's, gained more flow, more room, quieter and cut power from 15w each to 6 watts each.