awesome corals!!
fish are good with mysis, brine etc. most frozen foods are good for them. by inverts do you mean clean up crew? or do you have a shrimp (that i am unaware of?) but they can eat the same as fish.
mushrooms dont need to be fed, but i have fed mine mysis shrimp before. just turn off the flow so they dont float away, then the shroom should do the rest. not sure on how/what a torch likes, but im willing to guess he'll like mysis aswell.
garlic additives are to make a fish's appetite better, correct?? i've never needed to use it so honestly, cant help you there!