What I would do is Qarantine and treat with maracyn2 active ingredient is minocycline that has proven effective at sinking some types of lumps i would add to food it's more effective I use 1 quarter of a packet of maracyn2 1 table spoon of pellets 1 scoop of seachems focus 1 cap of seachems garlic guard a few drops of water mix well and feed a small amount twice daily for 7 days store any leftover medicated food in the fridge