You may need to go ahead and treat lucifer with a round of antibiotics. He just can’t seem to shake it. I would suggest Furan-2 and Seachem Kanaplex used together per package instructions. You can also use Spectrogram made by American Aquarium Products but you have to order it. The Spectogram already has the Furan-2 and Kanaplex mixed together and is easier to use. Just depends on which ones you can get the fastest.
Man poor guy okay thank u I just have had so many chemicals in the tank I hope i can find the antibiotics at the fish store i dont think i have time to wait for shipping it gets worse every day