Thanks so much! I haven't ruled out the possibility that I could've also nailed him/her with the vacuum ( it was my first time using a gravel vacuum), because prior to the cleaning, they both seemed to be active and avoiding the vacuum tube when I initially put it in the tank. Also, unfortunately I am colorblind so I don't really trust my judgement of colorations but I will gladly upload some photos. Thanks so much! I think I will buy two more frogs and get red worms or bloodworms.