My "pond" is a 180g Tuff tote and even with a cedar and chicken wire cover, I've gone outside in the morning to find a whole family of raccoons bouncing on top of the cover trying to get at the fish. They succeeded a few times in the past but now I have all sorts of ugly netting over top.
So you're lucky you don't have coons.
My parents had a big cube tank outside under their porch cover and woke up one day to a Blue Heron sitting on the edge gobbling up all their koi. That was in SE Vancouver, under an aluminum awning.
Anthony
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