2nd filter - can it hurt? - The Planted Tank Forum
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post #1 of 4 (permalink) Old 01-20-2014, 01:11 AM Thread Starter
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2nd filter - can it hurt?

Last week during my monthly filter maintenance my eheim 3e didn't want to start up again. I had found three pieces (the "float assembly") floating in the filter water. To avoid anything bad, I quickly hooked up a spare 2213 with 1/3 of the bio media from the other filter figuring it might take me some time to get the 3e fixed.

I called eheim technical support and they were able to help me and by the afternoon I had my 3e working again.

Now I have two filters running. The 3e is hooked up to a lily pipe and the 2213 to the spray bar it came with.

Is there a reason why too much water movement is negative? One concern I had was that it looked like the CO2 bubbles only made it to one side of the aquarium, because the spray bar is creating a strong cross current.
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post #2 of 4 (permalink) Old 01-20-2014, 01:22 AM
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The main reason too much water movement is bad is that your fish end up getting pushed around or have trouble swimming. Also, some plants don't really like it. I don't know about CO2 bubbles, I've never used CO2.
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post #3 of 4 (permalink) Old 01-20-2014, 01:43 AM
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There are ways of mitigating the flow, so in general I would say more filtration is almost always better. What kind of fish do you have? In my experience certain fish, like killies and some smaller ones generally dont take too well to all of the buffeting.

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post #4 of 4 (permalink) Old 01-20-2014, 02:06 AM
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I think you can position the filters' outputs opposite each other so they would cancel each other out. Otherwise, I think two filters are better than 1 because they would provide more bio media volume, and would also take more particulate matter from the water.
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