Canister vs Hob filter? - The Planted Tank Forum
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post #1 of 8 (permalink) Old 06-03-2018, 09:27 AM Thread Starter
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Canister vs Hob filter?

I have a 16.9 cube planted high tech... will canister reallly make a big difference then hob? Right now with surface agitation my drop checker is yellow about
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post #2 of 8 (permalink) Old 06-03-2018, 10:27 AM
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Do you mean with regards to CO2? If you are maintaining minimal surface agitation with your HOB, it is fine. With a canister, this is just simply a little easier

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post #3 of 8 (permalink) Old 06-03-2018, 02:55 PM Thread Starter
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I can’t maintain minimal agitation because I’m using that flow to make the co2 bubbles go everywhere
 
post #4 of 8 (permalink) Old 06-03-2018, 04:54 PM
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What type of difference are you looking for? Is you HOB working well right now? Seems like the CO2 is working. How about the rest of the tank?

There are a lot of people who use HOB with great success. Just depends what you are looking for. I used to run one on my 29 gallon with CO2, and just recently switched to a canister. For me I wanted high flow that would be tucked away a bit more than the HOB. Also I wanted my flow from wide to side on the tank not front to back (with a lid I had to literally place my HOB on the back).



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post #5 of 8 (permalink) Old 06-05-2018, 05:33 PM
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I prefer a HOB to a canister as a HOB generally provides more air / water interface for the absorption of oxygen. Canisters can lead to oxygen levels that are low enough to be unhealthy for the fish. Especially at night when the plants absorb oxygen out of the water and release CO2. When I ran canister filters I always had a bubble stone in the tank. Now I use wet / dry sumps so I don't worry about oxygen levels.
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post #6 of 8 (permalink) Old 06-05-2018, 07:07 PM
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For a cube tank, A HOB should do well enough. In a rectangular tank, no so much. How are the plants doing? That's really all that matters.
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post #7 of 8 (permalink) Old 06-06-2018, 01:47 AM
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Quote:
Originally Posted by Oughtsix View Post
I prefer a HOB to a canister as a HOB generally provides more air / water interface for the absorption of oxygen. Canisters can lead to oxygen levels that are low enough to be unhealthy for the fish. Especially at night when the plants absorb oxygen out of the water and release CO2. When I ran canister filters I always had a bubble stone in the tank. Now I use wet / dry sumps so I don't worry about oxygen levels.
You can always get a spray bar and point it at the surface for agitation, or add an additional wavemaker or pump to ripple the surface. The spray bar aimed up has been working very well for me. I also ru. A skimmer which I am sure helps as well. But you are right, if you use a canister with no surface agitation it can be a receipe for disaster.
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post #8 of 8 (permalink) Old 06-06-2018, 02:03 AM
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Are you concerned about CO2 absorption? I'm assuming you're using an inline CO2 diffuser if that's the case.
If the inline one doesn't work out for you, you can easily swap it for an in-tank one. You'll just need to clean it more often v.s. the inline one.
You may even find that you prefer the in-tank one, as it has larger bubbles that rise to the surface more quickly, allowing the water to be clearer (i.e., less hazy from all those micro-bubbles). You'll have less CO2 absorption though, and you'll need to use more CO2.


Oh well... there are always trade offs.
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