When I started using Excell to treat BBA I lost all my Corkscrew Val and Riccia. Both plants were doing great. The Vals had sent of runners in all directions and I was throwing out cups of Riccia with every water change. Now both are gone and the BBA is managable but still not totally eradicated. I lost 3 Panda Cories as well when I started dosing with Excell. Don't know if it was a coincidence or not.