Biological filteration nitrifying bacteria

[jun]

often hearing tat washing the bio filter materials with tap water will kills off the nitrifying bacteria in it....

i always change tank water with salt mixed with tap water.. each time i will do a 50% water change... will the nitrifying bacteria in my Biological filteration reduces/die off/weaken ...with these huge volume of 50% water change With tap water salt mixed??

[jun]

often hearing tat washing the bio filter materials with tap water will kills off the nitrifying bacteria in it....

i always change tank water with salt mixed with tap water.. each time i will do a 50% water change... will the nitrifying bacteria in my Biological filteration reduces/die off/weaken ...with these huge volume of 50% water change With tap water salt mixed??

sorry..to add tat.. my tap water is not filtered at all.... is purely from the tap...but b4 i do the water change to the tank, i leave it for days after i had mixed with salt..

[hammy]

yes , cleaning ur ' bacteria house' with tap water kill them. i am unsure whether is it due to chlorine or different salinity . but if there is a need to wash ur media, do wash it with slightly warm tank water to clear ur debris.

leaving ur water for days does dissipate chlorine into the atmosphere as chlorine is highly unstable. but there is this thing call chloramine which will never dissipate into the atmosphere.

once heard from my environmental prof saying that singapore do not use chloramine.. but i do not take chance, use water conditioner like seachem PRIME help to make the water condition better for water change