I put them in a 10 gallon hospital tank as they were in a 55 gallon. It was a female batta sorority. They were the only fish in the 55. All survived the ich but one and cleared up and once I put them back in the 55 they slowly died off there were about 16. They were a betta sorority. I moved them because it’s easier to medicate in a 10 gallon. Was this a mistake?