Reef Central Online Community

Home Forum Here you can view your subscribed threads, work with private messages and edit your profile and preferences View New Posts View Today's Posts

Find other members Frequently Asked Questions Search Reefkeeping ...an online magazine for marine aquarists Support our sponsors and mention Reef Central

Go Back   Reef Central Online Community Archives > General Interest Forums > Advanced Topics

 
 
Thread Tools Search this Thread Display Modes
  #1  
Old 11/11/2007, 03:58 PM
ooba ooba is offline
Registered Member
 
Join Date: Jun 2007
Location: Indiana
Posts: 61
how much flow is too muc flow?

drilling my 75 for closed loop. i have a sequence reeflo snapper, rated 1850gph @ 4'...is that too much for a 75? planning on keeping sps, nem, fairly light fish load, dsb...tank is drilled with a basement sump. dont really feel like drilling whopping big holes in the back of it, only to find out the cl pump i have hooked up makes the tank into a swirling vortex....
  #2  
Old 11/12/2007, 10:46 AM
amike5 amike5 is offline
Premium Member
 
Join Date: Oct 2006
Location: Englewood, CO
Posts: 642
On my 95 gallon, I use a snapper upgraded to 3500 gph. But it all depends on how you hook it up. If you have only 1 outlet, you will have a problem. Mine is on an Oceans Motions 4-way with 2 outlets per port (8 total outlets). If you are planning on sps, total turnover should be about 2700 - 3700 gph in your tank.
  #3  
Old 11/12/2007, 04:01 PM
hahnmeister hahnmeister is offline
El Jefe de WRS
 
Join Date: Sep 2005
Location: Brew City, WI
Posts: 8,639
gph isnt really an accurate way to measure flow in a tank, FWIW. Its kind of like watts per gallon... you know? You could have 10,000gph of low in your tank, but if it was all through diffusers and spraybars... it will look like less flow than a single 1000 watt powerhead in the corner blowing up a storm. Water flow can educt more water if under higher pressure, so that 1000gph pump is most likely moving a couple thousand more gallons per hour as a result.

There are two ways to do it... look at other's tanks with the amount of flow you desire, and mimic their results/equipment. Or, figure out the actual velocity of the water, and compare to scientific suggested flowrates.
__________________
"If at first, the idea is not absurd, then there is no hope for it"
-Al Einstein
  #4  
Old 11/12/2007, 04:19 PM
ooba ooba is offline
Registered Member
 
Join Date: Jun 2007
Location: Indiana
Posts: 61
Im not concerned with measurement at all...im just concerned about moving enough water about without turning my tank into a mess.

right now I'm planning on 4 1" outlets on locline from the CL, and my return pump is hooked up to a penguin eductor.
thank you for your answers.
  #5  
Old 11/13/2007, 09:37 AM
dendro982 dendro982 is offline
Registered Member
 
Join Date: Mar 2006
Location: Canada
Posts: 1,877
With basement sump the flow will be lower, it's more, than 4" usually.
But it's like 25x turnover per hour, you should be fine. There will be slower flow places for LPS and slow moving fish, and high flow - for all others.
In General discussions forum is the recent thread "Going bare bottom, what do I need" (or something like that), DSB keepers posted their flow rates.
  #6  
Old 11/13/2007, 03:28 PM
ooba ooba is offline
Registered Member
 
Join Date: Jun 2007
Location: Indiana
Posts: 61
thanks
  #7  
Old 11/13/2007, 05:39 PM
H2OLUVSME H2OLUVSME is offline
Premium Member
 
Join Date: May 2004
Location: MYRTLE BEACH, SC
Posts: 4,934
I ran over 4000gph in my old 75 and successfully kept LPS, SPS, and softies all together.

http://img.photobucket.com/albums/v6...9-19031_PB.jpg
__________________
Landon
  #8  
Old 11/14/2007, 02:37 PM
stugray stugray is offline
Premium Member
 
Join Date: May 2004
Location: Longmont, Co
Posts: 1,688
I have recent evidence that there is such a thing as too much flow:

I recently moved some of my CL nozzles because I moved a large rock, and two nozzles were digging a big hole in my sand, so I moved each one just a bit. I have 6 nozzles on my Dart CL.

I didnt notice, but I had pointed one right at a large brach of my best purple acro. After a couple of days the branch started bleaching, and that's when i noticed the nozzle pointing right at it. I have since moved the nozzle, but the coral ( the one branch ) is toast.

So..... there is such a thing as too much.

Stu
__________________
Some people think that I have Attention Deficit Disorder. They just dont understand that........ Hey! Look a chicken!
  #9  
Old 12/03/2007, 04:13 AM
Fitchguy Fitchguy is offline
Premium Member
 
Join Date: Oct 2006
Location: Tucson Arizona
Posts: 43
Just to Piggyback, I too have bleach out an Acropora by having it too close to a Seio 1500, pretty much blasting the color right out of it.
  #10  
Old 12/12/2007, 11:42 AM
dachsieholic dachsieholic is offline
Premium Member
 
Join Date: Jun 2007
Location: Denton, Texas
Posts: 48
flow

Thanks for the input about flow. I'm always reading trying to find out a good window for flow rate.
__________________
Dachshunds are like potato chips...you can't have just one!
  #11  
Old 12/14/2007, 01:56 PM
daddavis1 daddavis1 is offline
Registered Member
 
Join Date: Feb 2005
Location: Seymour, WI
Posts: 182
I have to agree that concentrated flows from a nozzle are troublesome. I made a low efficiency type of eductor to take a 3/4" out and create a 1.5" 20 degree cone to create strong but gentle current.
__________________
Digger
 

Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is On

Forum Jump


All times are GMT -5. The time now is 11:56 AM.


Powered by vBulletin® Version 3.8.4
Copyright ©2000 - 2024, Jelsoft Enterprises Ltd.
Use of this web site is subject to the terms and conditions described in the user agreement.
Reef Central™ Reef Central, LLC. Copyright ©1999-2009