why did my tropical fish die after changing the water?

A

artz hdz

New member
what was i supposed to do?
when i finished it was only about half full so i filled a bunch of buckets with water and put some of those purification drop things in there and waited a day then i put the water in and they all died
i had a bunch of guppies and mollies and some other tetras?
please can you explainn?
 
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