Tank size is fine..... IME, Bettas have always picked on Ottos, though. I've had them harass the peaceful algae eaters to death. Will never house Ottos with Bettas in my tanks. That said, not ALL Bettas are the same. Some are more laid back. It's always been male Bettas that went nuts on peaceful algae eaters in my tanks --- including the killing of snails.
Your tank size is fine, as @Fizgig777 pointed out, you'll just need to keep an eye if there's any aggression from the bettas. I've had some that did fine with even shrimps in a 5g, I've had some that would attack ANY sized fish in a 20g long community, every bettas' different - good luck!
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