I would have not treated the rocks in peroxide as done above in first post. a 6 mo build is fast upcoming, when you input bone new rocks you risk dinos ninefold. the reason the current live rock had some hitchhikers was due to no hand guiding at all, even during takedown. it didnt require a chemical burn, that wont fix anchored invaders. interestingly, it wont kill your biofilter either these rocks still have testable/provable ammonia control ability depending on what you do further.
the rocks should have been taken out, and had the anchored items rasped off with a metal knife, accurately, leaving 98% that isn't invaded untouched. you can put peroxide on the appropriate offenders after rasping (it doesnt work for many other types of items we want to cure back off rocks before reuse)
that rock had a life system built in that made your tank ninefold less likely to get dinos in the new build, peroxide isn't actually all that wrecking. if you want to etch it dry and fully restart then no new pics needed, it'll turn out just like marco rocks or any other type.
if you want to preserve the right life on them as best as possible, post current pics and keep them in clean, open topped saltwater container.
the next setup should have maintenance access built into the design, where you prevent ever having to redo live rock for the next 30 years. the new tank needs to have the willingness and plan to lift out live rocks if needed/access however is needed/and rasp off directly the invaders we'd usually allow to compound into a do over or a work thread where a given invasion challenges the tank for months and months. that direct access pre planning guarantees you cannot ever lose the new tank to any invader. we only lose tanks to invasion where refusal to access in one way or another occurs
your rocks do not need to be fed to keep bacteria alive while you wait. that adds more phosphate issues to a chain of loss that will already begin to upset the living portions of the rock, all that rock needs is no chemical burning, metal to rock removal surgery in specific places where needed, removal of any rock dieoff created by the burn so it wont rot in the holding tank, and clean running aerated water
the next six mos lets you assess what growth potentials are selected for and against, its better than a totally dry start. it will take years to earn the balance back from a full dry burn start