Mystery death of my shrimps

[dnsfpl]

recently my shrimp die of unknown reason
or at least i do not know the reason

26 Apr - routine 10% water change with aged water treated with anti-chlorine
29 Apr - 1 cherry died, Ammonia 0 Nitrite 0 pH 6.7
30 Apr - 1 CRS died, Ammonia 0 Nitrite 0 pH 6.8

could it be due to the recent hot weather?
i have no cooling device, no direct sunlight
my tank is position in my living room
if i place a bottle of ice into the tank, will the condense solution harm my fauna?

can anyone please enlighten me what is wrong
thank you


OT - for heavy planted tank, any tell tale sign to see if there are any dead corpse?

[kian]

temp of your tank?

[dcwk]

Temperature of tank can reach above 30C in these hot weather. Install a fan as soon as you can.

[dnsfpl]

current temperature is 29
hopefully it doesn't shoot up

[dcwk]

29C seems too high for CRS.

[dnsfpl]

getting a fan soon, hopefully by week end