Go Back   Aquarium Advice - Aquarium Forum Community > General Aquarium Forums > DIY Projects

Join Aquarium Advice Today
Thread Tools Search this Thread Display Modes
Please support our sponsors and let them know you heard about them on AquariumAdvice.com
Old 01-23-2009, 07:23 AM   #1
Aquarium Advice FINatic
Join Date: Sep 2008
Posts: 632
Limiting flow/turbulence from HOB filter

I have a 75-gallon tank with a 300 gph HOB filter. Initially the high water turnover was good for filtration, but as I've added more and more plants it seems increasingly unnecessary. I've just added a CO2 system and I'd like to limit flow so as to keep more gas dissolved. I've raised the water level until it no longer splashes, but what I have now is a strong circular current at the surface. I'm also looking at a couple fish that dislike current and like to just float at the top, so I'm looking for a way to either reduce the flow or direct it downward again.

I have a similar problem in my feeder tank, which is a 5 gallon with 40 gph filtration. I want to adapt that tank to house fairy shrimp, which are very weak swimmers.

I'm thinking about just sticking a sponge in the outflow, but I suspect I would just end up with a higher water level in the filter box and water overflowing the top of the sponge.

Any other ideas?

gzeiger is offline   Reply With Quote
Old 01-23-2009, 01:42 PM   #2
Aquarium Advice Apprentice
Egress's Avatar
Join Date: Jan 2006
Location: California, USA
Posts: 36
Send a message via ICQ to Egress Send a message via AIM to Egress
I've used aquaclear sponges as outflow baffles with good results. These sponges are a rather coarse open cell foam, so too much restriction wasn't a problem. I was using less powerful HOBs, though, rated in the 200GPH range.

Egress is offline   Reply With Quote
Old 01-23-2009, 01:50 PM   #3
Thanx but no.....

Join Date: Jun 2008
Posts: 2,333
pvc tube mounted horizontally (capped). Partial cut off to a half tube where HOB will flow into, holes drilled in the remainder.. Whamo, instant spray bar.

You'll have to play with the hole size until you get the right size without the cut end just spilling over.
CaptainAhab is offline   Reply With Quote
Old 01-23-2009, 06:45 PM   #4
Aquarium Advice Regular
Join Date: Dec 2008
Posts: 82
Wintertime experiments: a "Sponge box"

Try a sponge box!

it cuts the turbulence to zero.
Nyquil Junkie is offline   Reply With Quote
Old 01-25-2009, 10:58 AM   #5
AA Team Emeritus
Join Date: Jun 2005
Location: Whitby, Ont,Canada
Posts: 2,753
What brand of filter? If it were an AquaClear (mini up to a 70), a smaller impeller could be installed.
Join a fish club. Don't have one in your area? Start one.
BillD is offline   Reply With Quote
Old 01-25-2009, 08:23 PM   #6
Aquarium Advice FINatic
Join Date: Sep 2008
Posts: 632
This sponge box thing works great! Thanks for the ideas.

gzeiger is offline   Reply With Quote

filter, flow, hob, hob filter

Please support our sponsors and let them know you heard about them on AquariumAdvice.com

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 Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

Similar Threads
Thread Thread Starter Forum Replies Last Post
Need Advice... HOB Skimmer and HOB Filter ferchoz Saltwater & Reef - Getting Started 5 07-15-2009 03:35 PM
low flow through hob filters jimluann General Hardware/Equipment Discussion 2 08-13-2007 04:22 AM
Quick and dirty HOB filter flow diverter kennef DIY Projects 7 04-06-2007 01:03 AM
Aquaclear HOB: Water flow adjustment... Protege Freshwater & Brackish - General Discussion 1 10-30-2005 10:37 PM
EXTREMLY deminished flow from HOB filter William Freshwater & Brackish - General Discussion 14 11-03-2003 03:35 PM

» Photo Contest Winners

Our Communities

Our communities encompass many different hobbies and interests, but each one is built on friendly, intelligent membership.

» More about our Communities

Automotive Communities

Our Automotive communities encompass many different makes and models. From U.S. domestics to European Saloons.

» More about our Automotive Communities

Marine Communities

Our Marine websites focus on Cruising and Sailing Vessels, including forums and the largest cruising Wiki project on the web today.

» More about our Marine Communities

Copyright 2002-2012 Social Knowledge, LLC All Rights Reserved.

All times are GMT -4. The time now is 02:21 PM.

Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2016, vBulletin Solutions, Inc.