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Haley'sfish 
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Joined: September 30 2009
Location: Orem, Ut
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 Topic: Added flow behind rock work?
Posted: December 29 2010 at 12:33am |
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Do a lot of people hide power heads behind the rock work? What is everyone's opinion on how much flow for a tank, say a 90 gallon? Thanks!
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SGH360
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Posted: December 29 2010 at 1:55am |
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Their are many ways to add flow, you just have to find your style. I have just two powerheads. Each one on the back corner on the top pointed at the surface, to add agitation.
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Mark Peterson
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Posted: December 29 2010 at 11:22am |
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If you place those same powerheads at the back bottom corners it will not only add the movement that SGH360 talks about, but it will make a current that flows across the bottom, that is if there isn't too much rock on the bottom. The reefscaping makes a lot of difference.
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boysty
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Posted: December 29 2010 at 11:32am |
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I have a Mag 9.5 return pump and 2 Koralia 4's for flow on my 90g and love it.
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vadryn
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Posted: December 29 2010 at 11:43am |
I have a fluval 405 (running AC) as well as 3 Koralias. 1200, 1050, 1050 - on my 90g sumpless. That's between 40x-45x flow.
I am really limited by where I can place the powerheads; I have one that's just a few inches off the sandbed. The others are as low as I can go without completely reaquascaping - all aimed up.
Edited by vadryn - December 29 2010 at 11:58am
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Luckedout
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Posted: December 29 2010 at 11:52am |
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I think Bob recently re-did his tank where his rocks are not placed against the back of his tank and all his powerheads are back there... let me find the link because I thought it was a great idea.
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-Ben
90g Mixed reef
www.body-balancechiropractic.com
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Luckedout
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Posted: December 29 2010 at 11:56am |
Aww.. he changed it because apparently it worked too well.  Here's a link to the page where he did the set up. This is rather extreme but I think it's great. http://www.utahreefs.com/forum/forum_posts.asp?TID=24146&PN=30
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-Ben
90g Mixed reef
www.body-balancechiropractic.com
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Haley'sfish
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Posted: December 29 2010 at 12:52pm |
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Thank you, that was very helpful, I think I need one more powerhead. What does "40x-45x flow?" mean?
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Luckedout
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Posted: December 29 2010 at 1:21pm |
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It means turnover of total tank water volume.
90 gallons of water with a powerhead or return pump that is rated for 900 gph has a 10X flow.
One thing to remember is that a 90 gallon tank does not necessarily mean 90 gallons of water. Your rock, sand, corals, equipment and fish all displace water, so a 90 gallon tank probably has between 70-85 gallons of water in it depending on the tank.
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-Ben
90g Mixed reef
www.body-balancechiropractic.com
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