Tank in kitchen has fungus

Have had an issue with the tank in the kitchen as 2 of the juveniles have got fungus on their gills.

I have seperated the 2 healthy ones into another tank in the lounge and have started giving salt baths as per: https://sillyaxolotls.wixsite.com/sillyaxolotls/saltbath

This basically involves adding 2 tablespoons of sea salt to 2 litres of treated water and leaving each affected axolotl in the bath for 15 minutes.

I have been keeping a close eye on the two in the seperate tank and they don't appear to have any fungus at the moment so fingers crossed they will be ok.