My betta fish died, and I didnt do anything wrong with it.?

Dominick

New member
So today after coming home from college class.
I saw my betta fish laying flat on the ground.
he was swimming well last night. i feed him and went to bed..
He lived in a bowl with him self
no filter I changed water every week,and I had him for about a year and 9 months i think..
What can cause his death?
they told me they last over 3 years.. and I usually put tap water warm temp..
 
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