Would treat with prazipro and feed metroplex with Epsom salt solution mix. Then add Epsom salt to the tank at 1 tbsp per 5g. Can add seachem focus to make it into a paste.
Epsom sol mix - 1/2 cup distilled water and 3/4 tsp of epsom salt.
The bumps could be lymphocystis and spreading from one fish to the other. It’s like the common cold....one fish has it may go to another.
My suggestion.