Honestly, 5 gallons is far too small for more than one fish. The bioload probably got too high and since otos are very sensitive, they probably died from ammonia poisoning. if you want to keep multiple fish, 10 gallons is the minimum for SMALL tankmates, including otos and.dwarf cories. you can get away with inverts with a betta in 5 gallons, but more than one fish is just asking for.trouble.
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