My tank currently contains 2 Otos. I plan on ordering 6x Celestial Pearl Danio and also 5x Cory Hastatus. I know it's best to add fish slowly to allow bacterial colonies to throttle up to keep pace but I was really hoping to not have to pay the $$$ for express shipping twice. I've read that the CPDs are minimal in bioload due to their diminutive size and lack of constant activity. Has anyone added small amounts of ammonia to help ease larger transitions? Obviously I wouldn't add much ammonia, I don't want to endanger the Otos but perhaps small, consistent amounts until I add the new fish?