Disappearing shrimp - The Planted Tank Forum
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post #1 of 7 (permalink) Old 04-05-2013, 03:35 PM Thread Starter
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Disappearing shrimp

So I set up a new 10 gal tank. After it had cycled, I caught what I could of my cherry shrimp colony in the big tank and moved it to this tank (about 10 shrimps). That night, I can only find 2 shrimps.

Week or so later, I decide to clean the filter. Find all my missing shrimps in the bottom of the filter. Its a 10 gal tank, I am running an Aquaclear 30, and I have a filter-max sponge on the intake. How did they get in there?? I do have plants in the top of the HOB, but that filter is stuffed with so much media, I cannot believe they crawled through all of it to get to the bottom. If it were only one shrimp, I might just write it off... but this was about 8 of them in there.

It was kinda disappointing, really... I did all this work to set up a nice fish-free tank for them, and they decide to go live in the filter!
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post #2 of 7 (permalink) Old 04-05-2013, 04:01 PM
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Those sponge setups won't keep shrimp out of the filter. The sponge doesn't seal tightly enough against the plastic frame to keep a motivated shrimp out. I had one of these on my 2217, and there was a moderate sized colony of them living in there after about a month. The only thing I've found to keep shrimp out of an intake tube is a tightly fitting stainless steel prefilter. You can put the sponge over these if you want, too.
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post #3 of 7 (permalink) Old 04-05-2013, 04:16 PM
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A ziptie works wonders for creating a shrimp proof seal.

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post #4 of 7 (permalink) Old 04-05-2013, 04:16 PM
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Another idea people sometimes use is to use cable ties to secure the top opening so it is tight.

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post #5 of 7 (permalink) Old 04-05-2013, 04:42 PM
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I use the Fluval Prefilter sponge they fit tight and I never had anything get through

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post #6 of 7 (permalink) Old 04-05-2013, 04:48 PM Thread Starter
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Okay, thanks guys. Good to learn this with my adult shrimps, before I have babies disappearing in the filter! I thought this would be tight enough, because it does a good job of keeping shrimp out of my filter on my big tank. However, the filter on that tank is smaller than it ought to be, so the flow is not so strong. It all makes sense now!
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post #7 of 7 (permalink) Old 04-05-2013, 04:57 PM
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Wouldn't all the shrimp be chopped to pieces from the impeller if they went up the intake tube? My guess is they climbed in thru the front where the water comes out. I've witnessed my shrimp do it before. I dropped my water level a little to make it harder for them to climb up. Since then not 1 shrimp has made it back into my hob aquaclear.
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