Help With Powerhead Setup and Algae

[njphin]

I have a 80 gallon high tank thats been running for 6 months. For flow I have the return from my sump giving flow at the surface of the tank. Then I have to 2 koralia 2 setup on the back wall of tank that point towards the middle of the tank. If you look at the picture you will see how they are positioned. If looking at the tank on the left there is algae on the sand. But on the right side of the tank there is no algae. So im thinking the powerhead on the left is not positioned right or maybe I need more flow. Not sure. Looking to get opinions on getting better flow.

 

[thincat]

Try these positions:

 

[ChizerBunoi]

I like that rock arrangement.