They stressed, that's why attacking each other, also causes fin rot.. What
is your water quality?
PH, Ammonia, Nitrate, Nitrite etc...
How often you change water?

JS

"weetat" wrote in message
ups.com...
Hi all ,

I have 29 gallon tank , recently my three gold fish have died. (
cause i accidentally pour too much anti-bacteria medicine for dropsy )

Only left 3 gold fish without any dropsy , all theirs fin are rotted
.
And i had noticed that one of the gold fish is attacking others .

Any ideas how to cure the fin rot ? And please explain to me why the
goldfish are attacking other gold fish ?

Thanks