Filter Size - The Planted Tank Forum
LinkBack Thread Tools Display Modes
post #1 of 4 (permalink) Old 10-25-2007, 05:59 PM Thread Starter
Planted Member
alohamonte's Avatar
PTrader: (0/0%)
Join Date: Jul 2006
Location: Atlantis
Posts: 245
Filter Size

Is it better to run 1 large filter, or 2 smaller filters?

Example, Assuming all else is equal, is it better for run 1 filter at 500/gph or 2 filters at 250/gph?

Im in this situation now, where I'm unhappy with my circulation and do not know where to get a bigger replacement unit or a equal second one.


Smoke 'em if you got 'em.

20g Tall Low Tech Planted
alohamonte is offline  
Sponsored Links
post #2 of 4 (permalink) Old 10-25-2007, 07:29 PM
Planted Tank Enthusiast
Canoe2Can's Avatar
PTrader: (0/0%)
Join Date: Oct 2004
Location: Indiana, PA
Posts: 766
All things being equal, it's better to have two than one rated at the same capacity. It gives you redundancy and better water circulation.

That being said, I only run one. I guess I'm just too cheap to buy two and don't want to invest the time into cleaning a second. My tank is very lightly stocked though.
Canoe2Can is offline  
post #3 of 4 (permalink) Old 10-25-2007, 07:33 PM
Planted Tank Enthusiast
Mangala's Avatar
PTrader: (1/100%)
Join Date: Jul 2006
Location: Seattle, WA
Posts: 562
I've found MUCH better results with two filters over one. I think it has to do with fewer dead spots than you would have with just one filter. My experience is with overflow filters, hang over the back filters, and internal canister filters. I found I had to supplement my overflow with internal canister filters just to stop having so much crud in the tank, and so I would actually get flow to the bottom of the tank. --basically, if you are running a filter on your tank, you are hitting one area with inflow and one area with outflow of water, and your water and substrate/plants/decor will be really clean in that particular area, but there will be areas at relative "rest" where there is little flow and the mulm builds up and it's gross, and comes back two seconds after you do a water change. a second filter will help decrease that quite a bit. This is especially true on larger tanks (40+ gallons)

Mangala is offline  
post #4 of 4 (permalink) Old 10-25-2007, 07:48 PM
Planted Tank Enthusiast
turbosaurus's Avatar
PTrader: (44/100%)
Join Date: Nov 2005
Location: Yonkers, NY
Posts: 842
Definitely two.

You can spread out the flow much easier. That way you won't have 500gph blowing over all your plants on one side of the tank and dead spots on the other side. In addition, if one goes kaput, you're not forced to run out and pay retail for a replacement.

The only time I might consider just one is on a small tank (under 55 gal) or that isn't up against a wall, one that is open on all sides.

The plural of anecdote is not data
turbosaurus is offline  


Quick Reply

Register Now

In order to be able to post messages on the The Planted Tank Forum forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Please enter a password for your user account. Note that passwords are case-sensitive.


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:


Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode

Posting Rules  
You may post new threads
You may 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 On
Pingbacks are On
Refbacks are On

For the best viewing experience please update your browser to Google Chrome