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Old 04-28-2005, 01:44 AM   #11
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I would say yes, you need the power heads to circculate the water to keep O2 lvls up. You probably don't need as much as the coral keepers but you deffinately need the water to be moving otherwise it will get stagnant.
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Old 04-28-2005, 08:07 AM   #12
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Your going to need something moving the water. Certin algaes will grow much better in stagnant or semistagnant water so often just some water movement of 7X to 1 will keep some forms of algae from going out of control. In addition your SW fish have come from a habitat that has fast moving currents and on a health stand point putting them in a tank with nearly no current will not be good for them. Some fish, namly tangs and other big fish, will need these currents else they can sufficate or get them selves into trouble as they try to make their own currents.

For your size tank though a tang is way to big. I just used them as an example. You should shoot for 300-450GPH of overall water flow in the tank itself.
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Old 04-28-2005, 08:34 AM   #13
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Quote:
Originally Posted by zacdl
I have a 30 gal hex, but not planning on corals, do I need a powerhead?
You need circulation. Powerheads are the easiest way to achieve that amount necessary. I have an oceanic 32 hex and I currently am running a maxijet 750 and a fluval 104 (which means I barely meeting the min 10x gallon requirement for a saltwater tank). What are you using for circulation? I plan on adding another powerhead to increase circulation and surface agitation on my tank.
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Old 04-28-2005, 10:00 AM   #14
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Do you think I could have it pointing to the side kinda and just have the flow follow the outside walls? Kinda like a swirling tank of water.
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Old 04-29-2005, 08:35 AM   #15
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You need to look at the total gph of your circulation (and placement) since hex tanks are so tall.
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Old 04-29-2005, 10:26 AM   #16
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I was thinking AROUND 250.

I am planning on smaller fish, so I do not want to make it too hard for them to swim in.
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Old 04-29-2005, 01:14 PM   #17
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so how does the Tunze stream kit work, I have seen video of it in action, but what does it do? to achieve that?
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Old 04-29-2005, 08:16 PM   #18
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Yes, you still need a PH in your 30.
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Old 04-29-2005, 08:18 PM   #19
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Actually I was thinking I needed one anyway, I am concerned later on it may not be enough oxygen, so I will get one.

160 GPH is what I am going for (I am planning on small fish and dont want them to have harder time swimming, this would also keep the water moving pretty good too)
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Old 05-01-2005, 02:55 AM   #20
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I added a Tunze t24 kit as well. You can set the flow at your desire and change it up in a ton of different ways not to mention I can turn he tank over 40 times per hour if need be. I have it set at around 25 times per hour right now not to mention my mag 18 return pump. However you only need to go this extreme if you plan on an sps tank. Flow is needed for a healthy aquarium and solved my ph crashing problems at the same time.
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