I use one piece of live rock, which will stay there---and bring me worms, pods, sponges, and all sorts of good things. No potions. I use a sewage-like sludge remover in my koi pond outdoors, and it works well for what it does. I just drop in a few flakes of fish food a day; I don't use ammonia or raw shrimp or anything of the sort.
But here's the problem. Not that these are bad bacteria---but that cycling means more than just skinning-over the rock and sand with bacteria...no. It means giving time for the bacteria in a rock or a dose to spread out and not only coat every other rock, but to sink deep into crevices and pores of that rock.
This is WHY we recommend 4 weeks of cycling, partly because it can take that long for the bacteria colonies to develop in type and numbers, but also because a skin-coating of bacteria is awfully week, and not really up to handling a problem if one turns up.
The BEST course is 4 weeks of cycling (bacteria reproduce fast) and a cleanup crew working for four weeks, not because they're going to eat all the algae, but so their relatively mild poo can go on strengthening the bacteria and set up the natural cycle of poo to nitrogen gas. During that time you can have your first fish in quarantine. Not a herd of fishes---just one, or a mated pair...so you bring your tank under poo stress little at a time.
This avoids agony letters to RC asking What happened? My fish disappeared!