I would recommend feeding OSI flake, if you are not already(you can soak that in a little kyolic garlic powder and water). That will go miles in building up their natural immunity. The tang and angel will devour nori, so rub a cut clove of garlic on that as well.
Ultimately, nutritious feeding and optimum tank conditions will of course be the key to long term disease free success with fish.
Salinity must be kept much lower than 1.016 to kill parasites, I believe it is effective at 1.009, which must be done in a QT environment.
Possibly moving the lion and letting the shrimp in is an option for the short term relief of the fish, while they pile on some natural immunity.
Without knowing more about your tank care regime and test levels, that is about all I can offer. Hope it is of some help. :?
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