well 2 of the fish were old! You are lucky to have had them for so long.
I never get much more that 18 months -2 years from them.
Bettas are prone to tumors. the first betta I ever got died at age 2 with a mouth full of tumors- he basically starved.
I have also read that they are prone to lympocytic disease as well as tumors.
remember things tend to happen in 3's. I know it sounds silly but I can tell you that from many years in nursing when 1 patient died we always expected 2 more.
Things tend to go amiss in tanks one right after the other for no apparent reason.
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mousey
Toronto. Canada
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