Almost five weeks ago, I started a new 60g saltwater tank. I cycled the tank with live rock and two weeks in, my levels looked good. I added a Coral Beauty, Black Sebae Clownfish, and a Firefish. My levels increased across the board immediately but through water changes and cleanings, I was able to stabilize the tank. Now, I realize it was too much too quick.
About five days ago, I noticed my Firefish's organs behind his gills looking red and some fin rot. Two days ago, I started seeing red lesions (look like scratches or popped blood vessels) on his abdomen toward his tail. I attached two pics to show you what I am talking about.
I have read that this may be a bacterial infection. The issue seems to be aggravated by the fact that my Clownfish has started to be aggressive toward the Firefish and has begun to nip at him. Any suggestions for treatment and protecting the Firefish so he recovers?
My Clownfish also has an abnormal growth which started two weeks ago. I am posting a separate question for help dealing with that.