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post #1 of 7 (permalink) Old 10-18-2010, 06:39 PM Thread Starter
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RCS cluster


Sorry for the side picture but can anyone explain why my shrimp are doing this. They are all gathered on the cord of my heater and even if I shake them off they come back to the same spot. There isn't any food or anything that would gather them to this source.

My temp and water are fine. I just checked it.

This is the first time they have done this so I'm kinda curious if anyone might know why they are doing this.

Thanks,
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post #2 of 7 (permalink) Old 10-18-2010, 07:32 PM
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Too much co2 or too little oxygen maybe? Looks like they are trying to get to the surface where there is more o2/less co2.

If its not that then I dunno. Mine cluster to feed on the pre filter sponge. It's creepy... Like roaches.

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post #3 of 7 (permalink) Old 10-18-2010, 08:13 PM
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My RCS only do this for a food source. Maybe some algae at the top of that cord? My other guess would be as mentioned above... Looking for oxygen.
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post #4 of 7 (permalink) Old 10-18-2010, 09:11 PM Thread Starter
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I have 10 cory in the same tank and they seem to be fine so I'm not sure if it's oxygen or not.

I don't have co2 in the tank and it's full of anacharis and other plants so I would think the oxygen levels should be good.

I put some food in there to try and get them down but they won't budge.

I also found another group on the down spout of my filter and hanging onto my glass cleaner magnet? I've had these shrimp for over a year and I've never seen this behavior.
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post #5 of 7 (permalink) Old 10-18-2010, 10:47 PM
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maybe they are having group breeding... i tried to keep that comment as clean as possible
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post #6 of 7 (permalink) Old 10-19-2010, 01:18 AM
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It's probably some source of micro food that you can't see.
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post #7 of 7 (permalink) Old 10-19-2010, 03:21 AM
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possibly attracted to am electrical field,,mine do the same
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