rot

We noticed our one fish may have mouth rot. Do we need to separate it into another tank? We have 5 fish in a 60 gallon saltwater tank. Looking on advice as we are not quite sure. We have had this tank for 3 years and are still fairly newbies at caring for it. All water tests came back ok. The...

First time posting here. I've been looking around the site and haven't been convinced on the method to get rid of the rot and not effect the catfish. I have a 5in silver aro in with a 8in ripsaw catfish and noticed some fin rot starting to grow on the edges of the aro. He's in a 100 gallon...

I tried to leave a small bottom portion of the leaf that rotted away and the leaf did not regrow, the stem just rotted away as well. Should I cut in the middle of the stem next time?