You don't state what your other fish are, so how will anyone know if what they recommend, is safe for them or not.
Probably 98 % of species will b good with a salt/heat treatment, any rift lake African like your yellow lab, will be fine.
Some species (scaleless catfish for one from soft water) "are" sensitive to some commercial treatments.
So if you don't want to go thru this again, and 10 gallon hospital tank, usually costs less , than a bottle of meds, and should be used for all new fish.
Probably 98 % of species will b good with a salt/heat treatment, any rift lake African like your yellow lab, will be fine.
Some species (scaleless catfish for one from soft water) "are" sensitive to some commercial treatments.
So if you don't want to go thru this again, and 10 gallon hospital tank, usually costs less , than a bottle of meds, and should be used for all new fish.