Switching out filters and keeping the cycle going... - Betta Fish and Betta Fish Care
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post #1 of 6 (permalink) Old 08-04-2019, 11:29 AM Thread Starter
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Switching out filters and keeping the cycle going...

Hello,

I am in the process of switching from a power filter to a sponge filter in my 29 Gallon tank. I currently have both filters running in the tank. Would it be safe for the cycle to let the new filter run for a couple weeks with the old one, and then remove the old one? Or should I be a bit more cautious?

- Thanks!

2.5G - 1 female betta: "Miss Cleo"
5.5G - 1 betta: Half-moon King "Cobalt"
10G (with 4G of water) 1 female betta "Grace"
29G - 1 gold marble angelfish "Bartholomew"
1 Male fancy guppy "Guplet"
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post #2 of 6 (permalink) Old 08-04-2019, 12:50 PM
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I would run them side by side for a few weeks and leave the bacteria build up on the sponge filter before I removed the other filter.
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post #3 of 6 (permalink) Old 08-04-2019, 05:09 PM
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Six weeks to be absolutely safe. In smaller tanks 3-4 weeks.

My 60-Year Aquarium and 53-Year Betta Addictions
https://www.bettafish.com/144-journa...addiction.html

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post #4 of 6 (permalink) Old 08-05-2019, 06:50 PM Thread Starter
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Okay, thank you both for your replies. So basically leave them both for a whole cycle's time. Can I remove the entire old filter at once when it's time?

2.5G - 1 female betta: "Miss Cleo"
5.5G - 1 betta: Half-moon King "Cobalt"
10G (with 4G of water) 1 female betta "Grace"
29G - 1 gold marble angelfish "Bartholomew"
1 Male fancy guppy "Guplet"
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post #5 of 6 (permalink) Old 08-05-2019, 07:08 PM
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Yes, you can remove the old filter.

However, if it is not unsightly or has a malfunction, I would leave it in. I have two filters in my larger tanks for a couple of reasons:

1. If I get another tank;
2. If I need a hospital tank filter;
3. If one conks out I have an extra at the ready;
4. The more filtration the better.

Nitrifying bacteria needs water movement to stay viable (at least that's my understanding). So if one filter conks out I don't need to immediately go out and buy another filter and hope the established bacteria lives until I can get one.
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My 60-Year Aquarium and 53-Year Betta Addictions
https://www.bettafish.com/144-journa...addiction.html

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post #6 of 6 (permalink) Old 08-06-2019, 06:53 PM Thread Starter
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The old one is a nice filter, and works well, but the reason I am switching it out is because it's a bit too much flow for my angelfish and pleco. It's an Aquaclear 70 on a 29 gallon, so even on the lowest setting, the fish prefer the opposite side of the tank.

The only reason I have this filter is because I used to have a goldfish in that 29 gallon and, well, you know how that goes...😉
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2.5G - 1 female betta: "Miss Cleo"
5.5G - 1 betta: Half-moon King "Cobalt"
10G (with 4G of water) 1 female betta "Grace"
29G - 1 gold marble angelfish "Bartholomew"
1 Male fancy guppy "Guplet"
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