After extensive tests over the past 5 years it is finally determined that my congo has epilepsy. Marvin had 2 years of seizures no more than 1 per month. Then it stopped for 2 years and I thought that it was caused from the sponges that I used to clean the water bowl. Then they started again. My avian vet ( who is awesome - DR. Kilgore ) has run every test possible and then referred me to Angell in boston to see Dr. Orcutt DVM, ABVP. She concluded that she felt that he had epilepsy also. The only other test to run was a cat scan, but she felt that it would not yeild any results. She is also treating 1 other congo for the same thing. That bird was seizuring daily. Marvin is now 2 to 4 times per month. So... I have just started him on meds and we will see how it goes. If anyone else has a seizuring congo ( if not caused from a lack of calcium ) I would be interested to hear about your bird.