weird behaviour cherry shrimps

[eugene_syh]

Hi bros, my tank has abt 30cherries n 16crs.
Just today I noticed a weird behaviour, about 8-10 of the cherries will gather near the top of my moss wall. Is this like a breeding ritual or sth? Usu theres about 2 females and 8 males. At first I thought it was a water problem, I changed 20% of the water but they're still going back to the top, another reason why I doubt it's water problem is that my CDs are behaving perfectly normal. I assume that CDs are generally more sensitive to water parameters. Any similar phenonmenon experienced by other bros here????

[eugene_syh]

i meant CRS. not CDS

[eugene_syh]

oh crap, no one knows? now i have 3 dead cherries in 3 days but no CRS deaths. it's puzzling. old age? haha.

[NingNing]

dude... your ph is the problem.

[eugene_syh]

no leh i checked already. everythings back to normal after i added in supplements and bacteria.. i suspect it's the 2 hour cut in electricity. is 2 hours enough to kill the bacteria in the filter??