Dead spots with my Hydors

So i've noticed I have two dead spots in my tank. Basically the corners on each end arent getting enough flow. I've got two hydor 1400's in the tank. The tank is a 210G that is fish only with 200lbs of rock. I've noticed in the corners that there is like a tornado of sand that spins right by the overflows but those two spots of the tank are the only spots that im getting algae. I've tried to move the hydors around some but havent had much luck. Currently they are by the overflow pointed out towards the middle of the tank. Any thoughts on what I should do? Add another hydor?

 

Hopefully that will help as you can see its basically identical on both sides.

 

ya may need another one to help! but maybe try lowering them more and aiming them towards the top front middle!

 

Thanks cosmo, i'll try that and see if it helps. If not then another hydor it is.

 

Aim them towards the glass so thy it bounces off and continues throughout the tank. I find that that's the key with koralias.

 

These are pointed towards the middle of the tank to hit the glass. It just seem's like they hit the whole tank except these two areas. You can see in the middle of the tank where the sand is being hit because it makes a huge hole per say lol

 

You look like you have a very nice tank. More pics!