Oh my... sorry to hear that bro.

But, just curious... you turn on air pump every night? I don't have any air pumps whatsoever... just position my outflow pipe high enough to create surface agitation. It's still under the water, not above or mid water level.

I guess with plants in it too... air pump's not required. At least for me...

Only thing is if biofilm develops on the surface I'll just 'clean' it up a bit so the outflow can create vortex again, coz at times I could see quite a lot of CO2 bubbles on the surface.

Beside that.  Anything you done to your tank? Co2 on 24hrs?

have a same situation with you, 4 malaya shrimp dead 2 days, but not because i forgotten to switch off the co2, is i increase co2 to kill BBA. Seems i've accidentally increase it too much for the shrimps to take. Fishes are ok...

hi actually how long we need to acclimatize the shrimps. i just received RCS this afternoon and acclimate for 2 hours before put inside the aquarium. i know the period too short because i need to go out...hope do not get any casualitites... i saw 1 shrimp lying below 1 rock, i think it moulting...