if you feed a lot of supports, the bac will live and still regulate themselves as normal colonies do in nature only you'll have lots extra organics in the tank possibly doing what they do unrelated to your bac issues
if you feed a little of something, the bac eat it and not much extra happens on the organic side
if you feed nothing and just keep the tank wet, absolutely nothing changes in the bacteria as they get food without your help unless you are reefing in a micro lab, really that's how it is
its ok to feed or not. we have a particular thread at nano reef.com that shows ammonia digest testing in a fallow setup that was running about 24 mos or so unfed with only water changes, amazing length of time for someone to test that. user/dandelion.
aquarists will not accept that what they add or not add wont affect seated bacteria, surface area presentation is what modulates them greatest, aquarists must add feed to the tank to ease their own concerns the bacteria are independent of how weird it feels to not feed a reef aquarium for three months.
your live rock animals, benthic mobile creatures, sponges if applic, they want feed and as a side benefit from keeping those animals plump, bacteria are still doing what they do.