i bought two otos the other day and cant find a oto. i took everything out and no look. The lady at petsmart said it couldve been eaten by the gourami
They can't fit in there mouth. Highly unlikely.. Did you look under your filter, the little lip that hangs into the water. Mine was hiding there a few times as I was freakin out lol. I have quite a few Gouramis and they really aren't aggressive..