Two filters for the power of one? - The Planted Tank Forum
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post #1 of 34 (permalink) Old 07-25-2013, 03:03 AM Thread Starter
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Two filters for the power of one?

I don't know this is possible but if I were to get two filters rated for 30 gallons and put them on a 40 gallon tank will they turn over the water enough for a goldfish (very messy fish).

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post #2 of 34 (permalink) Old 07-25-2013, 03:10 AM
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I don't know if you have the two filters laying around and want to save money and use them, but if not I would just straight off get a larger filter...
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post #3 of 34 (permalink) Old 07-25-2013, 03:19 AM Thread Starter
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Yes I would just want to save money but getting a larger one seems more practical. If I can do it I will. I'll keep watching for new posts.

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post #4 of 34 (permalink) Old 07-25-2013, 03:56 AM
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I'm not sure which filters you're thinking of, but for an aquaclear for example, two twenties ($45 according to amazon) would be more expensive than one fifty ($35)...
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post #5 of 34 (permalink) Old 07-25-2013, 03:57 AM Thread Starter
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Ok for sure then I will go with one filter not two thanks for the help.

Though if I had two laying around I would totally ditch buying a new one and use the two.

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Last edited by Darkblade48; 07-25-2013 at 09:57 AM. Reason: Please use the edit function for back to back posts to keep threads cleaner
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post #6 of 34 (permalink) Old 07-25-2013, 05:43 AM
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Actually I would vote for 2 filters for a couple of reasons. First, you can stagger cleaning of the 2 so you don't damage the bacteria colony of the entire tank. Also, if one broke, you still have some filtration while you can fix/replace the other. Sort of like not putting all your eggs in one basket. Having 2 filters would give you more media options as well. Could do Purigen in one and Seachem Matrix in the other, or whatever you want, the options are endless. Also could adjust the placement of the 2 filters to better filter the water in the entire tank and not have any dead spots. In my tanks, I run a HOB and a separate sponge filter run by an air pump. Same concept, 2 types of filtration to spread the bacteria colony.
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post #7 of 34 (permalink) Old 07-25-2013, 08:44 AM
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Kinda like Dolfan said, I'd go multiple filters. For a 40G, I personally would get a canister and a HOB. Would say sponge filters too, but not needed for goldfish. More media options, more water movement, etc. Look around, i found a set of 2 AC20's on fleabay for $30 shipped, jumped on that faaast. Lol


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post #8 of 34 (permalink) Old 07-25-2013, 01:45 PM Thread Starter
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Ok so 2 filters would turn over the water enough, what flow rate am I looking for with a goldfish and some loaches?

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post #9 of 34 (permalink) Old 07-25-2013, 05:03 PM
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I would think since goldfish are a bit messy you would want a 10X flow rate total. So for your 40 gallon tank, a combined flow rate of around 400 gph between the 2 filters. A canister and a HOB would be ideal, like Mjbn suggested. 2 HOB's would also do you well if you were wanting to save money. Check Bigalspets.com and/or kensfish.com they are both very cheap and customer friendly vendors.
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post #10 of 34 (permalink) Old 07-25-2013, 06:15 PM Thread Starter
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Turning over the water 10 time in a hour? That's a lot!

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Last edited by Coldwater King; 07-25-2013 at 08:33 PM. Reason: grammer
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post #11 of 34 (permalink) Old 07-25-2013, 06:20 PM
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Quote:
Originally Posted by Coldwater King View Post
Turning over the 10 time in a hour? That's a lot!
General Rule that I typically follow is 4X per hour minimum... But for Goldfish i would at least double that! You can use sponges to baffle the output of the filter if the flow rate is blowing them all over the place (most fancies are terrible swimmers).
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post #12 of 34 (permalink) Old 07-25-2013, 10:49 PM Thread Starter
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What flow rate am I expecting out of a 100gph filter packed with media?

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post #13 of 34 (permalink) Old 07-26-2013, 01:40 AM
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Depends on the manufacturer. Read the label. Some test with the filter filled with media, so their numbers are not too far off. Some test when the filter is empty, and are just imaginary numbers with no basis in reality.

Remember that as the filter fills with debris it will slow down.

I generally aim for 10x, combination of filters and power heads. I like the larger volume of most canisters. I like the large volume and the layout of the media in the Aquaclears.

If I was keeping Golds in a 40 I would use at least a Rena Filstar XP3, yes, a THREE. Or else an Aquaclear 70. That is a LOT of water movement, but it can be arranged so the Golds are not blown all over the tank.
I had some golds in a 45 gallon. They grew so fast they were only in there for a few months, then out to the pond. They were Shubunkins with long fins, so highly active fish, though not quite as fast as a short finned comet.
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post #14 of 34 (permalink) Old 07-26-2013, 02:28 AM Thread Starter
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People who have kept goldfish how hard is it to maintain a 40 with a few of them? How many gallons for a wc out of a 40?

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Last edited by Coldwater King; 07-26-2013 at 02:02 PM. Reason: k
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post #15 of 34 (permalink) Old 07-26-2013, 02:02 PM Thread Starter
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Bump

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