Placing a high flow powerhead down low with the stream shooting almost vertically up to the center surface water is the best way to create good flow all around. No dead spots. NONE. The fast flow is less likely to mess up the sand (and there are nice easy ways to fix that too. I know 100's of tips for all this.)
The powerhead can then be hidden behind aquascaping making the tank look more natural. If the cord ends up being too short, a $2 extension cord helps it reach the power outlet.
The Hydor Koralia base socket can be notched so that the red post on the ball can slip into the notch and the thing can be angled more vertical. I do this all the time. It works awesome.
Aloha,
Mark
808-345-1049
An amazing plus for having water shoot up to the surface is the energetic wave motion it creates at the surface and throughout the entire tank. This pic is an example from MarksReef Coral Farm, which everyone is invited to visit.
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