I believe all your BB died too better to speed up the Nitrogen Cycle so it can lower ammonia level

thanks guys!!
not sure, its stronger during rainy season.
but before going into my tanbk there is a carbon filter and sediment filter ,
but not enough to remove chlorine overnight.

output of that goes into 2 tanks , the tank with clownloaches has wesker flow.
my BD and arowana tank was on full blast :(

The spec of the carbon filter? Is there chloramine in the tap water? Take note of the ammonia. Can add bb just in case.

Fortunately, for your fishes, low dose of chloromine and cholrine where you are at
Phewwwwwww

Tk care dude