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post #1 of 4 (permalink) Old 10-25-2007, 05:59 PM Thread Starter
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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.

Monte

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post #2 of 4 (permalink) Old 10-25-2007, 07:29 PM
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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.
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post #3 of 4 (permalink) Old 10-25-2007, 07:33 PM
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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)

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post #4 of 4 (permalink) Old 10-25-2007, 07:48 PM
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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.

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