!25 Gal Filters - Tropical Fish Keeping - Aquarium fish care and resources
LinkBack Thread Tools
post #1 of 5 Old 12-23-2009, 08:19 PM Thread Starter
New Member
!25 Gal Filters

I'm going to be setting up my 125 soon and am having a hard time deciding what type of filter to use. In my 55 I have a penguin 350 and only use the bio-wheels(no carbon inserts) I've done this for about 6 months and have had no problems.

I'm looking at doing a canister filter or 2 penguin 350's or 2 emperor 400's. The canister would circulate the water more as far as creating a circle of filtration. However I've read for best bacteria growth oxygen is needed and that's where the bio-wheel would be better.

I plan to have angels and some silver dollars for sure in the 125 and some of the larger fish.I also plan to have a decent amount of plants as well. If anyone can give advice I'd appreciate it.
alrcs8191 is offline  
Sponsored Links
post #2 of 5 Old 12-23-2009, 08:35 PM
Gold Member
aunt kymmie's Avatar
I'm zero help with recommending equipment as I only have experience with mine. Others with more experience can comment, mostly I wanted to jump in here and say, "Welcome to the forum!". We're glad you decided to join us.

If you don't stand up for something you'll fall for anything...
aunt kymmie is offline  
post #3 of 5 Old 12-23-2009, 08:55 PM
Byron's Avatar
Filtration in a planted tank should be minimal, in terms of water movement and surface disturbance. The plants do the major filtration and "clean" the water; the filter is only there to create a sufficient current (depending upon the type of fish this may be more or less) to move the water through the filter media so the particulate matter can be captured (the "clear" water aspect of filtration).

I've written previously in detail on why this is important, and for ease here it is copied over:

The rate of water flow through the filter has an impact on the amount of oxygen drawn into the water, and carbon dioxide (CO2) expelled from the water in what we call the gaseous exchange. Surface disturbance speeds this up, as does higher flow filtration, airstones and bubble effects and powerheads. There are two detrimental issues to this: CO2 which is extremely important for plant growth is driven out of the water faster, and oxygen is brought into the water at levels beyond what is good for the plants. Plants have more difficulty assimilating nutrients when the oxygen level increases. But the more significant aspect is the CO2.

Submerged plants have difficulty obtaining enough CO2 in nature and in the aquarium; this fact is believed by many to be the reason for the inherently slow growth and low productivity of aquatic plants over terrestrial. Further, freshwater emerged plants have been shown to be more than four times more productive that submerged plants. The reason is because CO2 diffuses so slowly in water as opposed to air, and this limits the underwater plant's uptake of CO2 because the CO2 molecules don't contact the leaves quick enough to meet the plant's needs. Aquatic plants have to use enzymes to rapidly capture the CO2. When the CO2 levels in the water become depleted, these enzymes sit idle, so to speak, but the plant still has to provide energy to them. This results in a reduction in photosynthetic efficiency and therefore growth of the plant because energy is being wasted. Thus, any thing that removes CO2 in however small an amount will be detrimental to the plant's growth.

In a natural or low-tech system, the balance between the 17 nutrients (one of which is carbon) and light has to be there; so anything that may impact however slightly can become a critical factor in less success. The one thing we cannot "control" in this type of setup is the CO2, by which I mean that it is entirely dependent upon the fish and biological processes; with light we can control it, in intensity and duration, to balance, as we can with the other macro- and micro-nutrients through fertilization. Plants will photosynthesize up to the factor in least supply. Many have planted tanks that fail because the CO2 is the limiting factor, and algae will take over because it is better able to use carbonates for carbon than most (but not all) plants. The point here is that nothing should be allowed to negatively impact the CO2 in a natural planted aquarium.

Plants produce copious amounts of oxygen during photosynthesis, much more than they and the fish consume during darkness.

The water flow is important for bringing nutrients to the leaves and roots, and keeping the leaves free of sediments. But there has to be a balance so as not to adversely affect the plants ability to assimilate nutrients including carbon from CO2.

To minimize surface disturbance I would select a good canister filter; the spraybar can be positioned beneath the surface. As explained above, oxygen is not an issue in a planted aquarium.


Byron Hosking, BMus, MA
Vancouver, BC, Canada

The aquarist is one who must learn the ways of the biologist, the chemist, and the veterinarian. [unknown source]

Something we all need to remember: The fish you've acquired was quite happy not being owned by you, minding its own business. If you’re going to take it under your wing then you’re responsible for it. Every aspect of its life is under your control, from water quality and temperature to swimming space. [Nathan Hill in PFK]
Byron is offline  
post #4 of 5 Old 12-23-2009, 10:36 PM
Angel079's Avatar
I pers wouldn't wanna have to run 2 filters...either get 1 large canister or a sumb...me pers I'd get a large Eheim Canister for this tank and I'm def no fan of these nosiy bio wheel HOB's at all, don't work for me, nor my plants, don't work lol

~ Life Is Too Short, Break The Rules, Forgive Quickly, Kiss Slowly, Love Truly, Laugh Uncontrollably And Never Regret Anything that Made You Smile.
Life May Not Be The Party We Hoped For, But While We're Here, We Should Dance. ~
Angel079 is offline  
post #5 of 5 Old 12-23-2009, 11:46 PM
New Member
Thanks for the short plant article, I've printed it out for a friend and myself. I'm waiting for Boxing Day to visit King Ed for my aquarium. I actually offered a chap at BC Aqauria more money than he was asking for concerning his 80 gallon tank on the condition he could deliver to me in Deep Cove. He couldn't get it into his Honda Civic so that deal fell through.
rsn48 is offline  

Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page

Similar Threads
Thread Thread Starter Forum Replies Last Post
Wet dry filters? willieturnip Beginner Saltwater Aquariums 6 11-11-2009 07:47 PM
Wet/Dry Filters IMPEGA Saltwater Aquarium Equipment 2 09-28-2009 09:49 PM
Canister filters vs. Hang-on filters. MattD Freshwater Aquarium Equipment 7 06-09-2007 09:49 PM

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 On
Pingbacks are On
Refbacks are On

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