You've done nothing wrong Meg, it's probably due to a change in food. I had them on Albon here for several weeks (well over a month ago) and it cleared up the pancakes. They never seemed to have all out diarrhea though. Maybe you should keep them both in the bathroom, or the cage until their tummies acclimate. I had them on a mixture of Purina kitten chow/ regular & Purina One, Science Diet Growth, and Iams all mixed togther along with wet food AM & PM. They seemed to do well on it. Both have been wormed for round worms several times as well, so it's unlikey to be them. Maybe a stool check for Gabe will give you answers. You can't let him keep going on the basement floor though! You may want to see if your vet carries "amphoral" which works great for knocking out diarrhea. Three times a day X 3 days. Keep me posted.