Cherry Shrimp huddle

I'm new to shrimps, but my cherry shrimps have been doing well, some are carrying eggs, others have successfully molted.
Today, my shrimps all appear to be huddling in the top corner which is new behaviour to me. They're usually dotted around all over the tank. I've done a 30% w/c slightly ahead of schedule (tank maintenance is due this evening). Is this anything to be concerned about? Thanks

Did you remember to add de-chlorinator?
Mine are more active after a water change but that looks like they might be trying to escape (from something that's irritating them).

I believe we have all experienced the case of missing fish. I’m sorry for your loss. Glad to have you join us though.

Nothing to worry about
Exception if majority of your shrimp molt after 4-12 hours water change. And trying to jump out of water.

Looks like one has died today. They have since disbanded the huddle after doing my main, weekly water change.

I'll keep an eye out for any molting, thank you