Join Date: Aug 2011
Location: Kingston, Ontario
Yea, sometimes they lash out even after being fine for a while.
I'd probably find a larger container for the guppy and treat for rot..
How large is the tank?
Your two options are adding a ton of plant cover (think a female betta sorority) to reduce chances of aggression, or just separate the betta.
It's happened once, it will pretty likely happen again.
edit: I'm sorry the guppy died.. I'd probably put the betta in the one gallon for now.
You're going to have to buy the guppy a friend as they get lonely..
taking a break from fish-keeping.
3 lovely male betta still keep me company.