i am not sure of the disease, all i know, is it got in my 100 and 55 from some feeders from the lfs. i saw white specs on a convict i also purchased about 5 days later and noticed the spots on a couple feeders. so i treated both tanks for ich. i used nix-ich. 3 days after initial treatment i lost the stock. then 6 days later i lost my blue cat.