I don't know what size tank you have but adding a few more may help. Not all cories are out in the front of the tank caring less that you're watching them. My black aeneus cories and my albino cories are always out in front and all over the tank fearlessly. My sterbai's hide. Both tanks of them. I have at least a dozen sterbai in my 75G along with a few albinos, and seeing the albinos out and about does nothing to give the sterbai braveness.