What happened to my CRS?

[Optimus Prime]

I found one of my CRS died on last 3 days...and yesterday i found another dead body in my tank again... I do water changes and parameter checking and get the following parameter:

pH6.8
GH: 7
KH: 1
NH3/NH4: 0
Temp: 25-27C

My parameter should be no problem right? but how come recently CRS died so frequently?
and last 2 days, i found one of the CRS pregnant... those dead CRS are adult, and the CRS babies all seem like ok and normal... I wonder what happen to my CRS? thanks for you guys helps....

P/S: i added in bamboo charcoal into my CRS tank last week, is it the main reason that caused to my CRS died?

[sazuka]

bro, how about your no2 n no3?
i dont think bamboo charcoal will cause the death of your crs.

[Optimus Prime]

I did not check the no2 and no3..
Ok, i will try to measure on it...

My tank is 12 inch and around 25L, inside got around 15-18 CRS... is this also a reason that caused my CRS died?

[TitoC]

any developments here Optimus?
did you manage to figure out what went wrong?

[Optimus Prime]

any developments here Optimus?
did you manage to figure out what went wrong?

Emm...I also what is the actual cause...
I just changed water and observed...now seem like everything goes well....
and, I saw another CRS carry eggs now..

[varez]

Hi,

With kh 1 you have a floating pH.Maybe that was the reason....

[skewlboy30]

what is a floating ph?

[Trocado]

unstable pH, it oscillates

[skewlboy30]

I get it, thanks

[prawny]

sorry but why does a kh of 1 lead to unstable ph? if i have kh of 0 is it good or bad? my ph is close to 6