Hi experts,

i just bot lot of guppies from a lfs last nite. But did saw some guppies dying in their tank. Can't see there is anything wrong in lfs. But after putting in my tank. I saw..."FIN ROT!"

I don't know this is due to "ammonia burn" or really a fin rot. So i didnt put any medicine. if ammonia burn, then they will fine without any medic.

I found 30 over of them died and 20 over dying this morning. All the dying or died guppies are from the same lfs. The other female guppies from another lfs are fine.

my Q is, why the guppies dying slowly in lfs tank. and why died so fast in my tank? Due to stress being captured? Or other reason?