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Old 12-12-2006, 12:20 PM   #31
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I wouldn't point a powerhead at the sand. Your best bet is to have two powerheads on opposite ends of the tank and point them both towards the middle of the front of the tank so that they break the surface of the water.

Check out this example from my tank: http://homepage.mac.com/rubikcube/images/fishlights.jpg

(Algae problems have since been fixed)
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Old 12-12-2006, 12:30 PM   #32
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I have 3 powerheads in my 29 gallon tank. 1 pointing to the surface and 2 pointing in alternating positions along the side of the tank to create a circular flow. Has worked wonders for me in regards to cyanobacteria after adding the third powerhead. You can stick 8 powerheads on the top of your tank, but with none getting to the bottom you'll still have cyano problems.

Hope this helps. I agree with the others that another powerhead could be the answer to you problems.
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Old 12-12-2006, 12:53 PM   #33
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Thanks. I originally purchased 2 powerheads but now I sort've wished I had 3

Currently I have 1 in front right top and one in back left top and they shoot straight/slightly up, so they create air at the top and sorta make a whirlpool effect. I will consider moving the front top right one to the back top right and have them shoot in a V to the front middle.

I will also have 800gph filter when it's back and I'll aim that one down at the live rocks from the back left middle.
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Old 12-12-2006, 12:59 PM   #34
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Alrighty. I'll give that a go, with the darkness. I'll post my results in the coming days.

Picked up a MJ1200 and put it on the back left glass aimed at the front of the glass and the surface. I moved the penguin 1140 to point at the glass, but in a slightly downward angle. Now I have excellent surface agitation, and the algae is blowing slowly and gently off the sand bed as we speak. Water I guess is doing a circle.

Will post a pic after each day.
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Old 12-13-2006, 09:16 AM   #35
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Sand bed is starting to look better already as of this morning.

Will take pictures and post when I get home.
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