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Sorry. That's a 10-year old, TWENTY-gallon tank

I have a well-established, apparently healthy 10-year old, 10-gallon tank.  It's  well-planted and I change out a gallon every two weeks.  Current population is 2 4-year old black skirt tetras,  a corydora, a small plecostomus and an eight-year old blue gourami.  Until yesterday, the gourami...