On Monday one of my Boesemani Rainbow fish got caught in a hole in one of my decorative rocks. After I freed him, I could see obvious wounds on his back and belly. I made a small hospital tank with water from main tank and started treating with salt. His wounds seemed to be healing. Because I don’t have filtration for the hospital tank, I moved him to a second hospital tank with water from main tank last night. This morning, he has this “string” hanging from his lower wound. The hospital tank is too small, so I had planned to return him to the big tank with short periods of time in the salted tank. Now I’m not sure what course to take. Thoughts?