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Shrimp going crazy after lights on


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Hi everyone,


So. strangest thing ever lately happening in one of my tanks.

Since around a week or maybe a bit more the shrimp are acting stressed after the lights turn on. It's not instantly after the lights go on, but about after 1 hour or so. All shrimp stop grazing and start swimming around the tank restless to finally calm down after 30-60 mins more or less. It doesn't matter male or female, small or big all act the same like there would be some massive shift in water chemistry, but I have no idea what could it be.


So when I first saw this I used active carbon couple of times and thought that it helped as the shrimp have returned to grazing over time, but now I don't use it any more and they also do calm down after a while. No deaths so far, and the shrimp don't twitch when swimming around.

Does anyone have an idea of what could be happening?



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