there is no such thing as an all-in-one supplement. you will cause more harm than good.
mushrooms don't need anything that's not readily available in the water column.
build a skeleton out of calcium which they take from the water column as well, and can get all they need if regular water changes are performed with a reef grade salt mix.
if you have a lot of lps
and calcium levels are depleted, you'll have to add it correctly. you can't just pour calcium in the tank because it will effect your alkalinity as well. you will need to purchase a 2 (3) part additive to do so.
i would strongly suggest (as above) to not add anything to your tank you haven't tested for and are sure you need.