I noticed one of fantails had clamped fins,small hole in tail,tips of tail were a brownish color and opaque areas on tail. I brought him in and put him in hospital tank and did one round of treatment with furan 2. Fins are no longer clamped, opaque areas are just about gone,brown tips are almost gone but still has hole in fin and there are still a couple of splits in the tail so I decided to continue with another round of furan2 since it seems to be improving with it. So my question is how do I know when it is ok to put back in the pond. I have 2 more days of the second round of furan2