My 2 columbian tetra have got black patches and there bellys have swollen up. i have read around the internet and i think its myxobactrium or how ever you spell it. I really dont want the rest of my tank to get it! i have 3 columbian tetra and the 3rd one hasnt developed any symptoms off it but i will keep an eye on him. i have never seen any treatment for this avalible at any of my lfs. What do i do?