well lets see, i have polyps, mushrooms, stars,, clsms, macroalgaes, pnut and spagetti and bristle worms, lots of pods, snails, sponges(2 types thay i can see), feather dusters AND who knows what else, in my tank, none of which i purchased but hitchiked in on the rock, as far as toxicity goes, the bacteria will break everything down and the amonia will disipate, the nitrates will go up and so on, if you are cycling with lr, thaer is no need to do anything but wait, you will not speed it up , you will not help it, and it will take care of itself, you may lower the ammonia level some, but if you do enough to lower it significantly, IME(experience, not opinion) it will slow it down IF anything, and not only my experience, but others here on the board can attest to it too, once they stopped(after months) in days they had finished(finally)(you can search through past posts and get more input too. along with responses telling their results afterwards),
TO sum it up, you want the garbage in the water for the cycle(the water change does not remove the bacteria that you want but the garbage that feeds its growth), it does not hurt and only helps the cycle if anything, just clean off the excess sediment that is settling, water changes will not stop the cycle, but significant amounts can delay it, like i said,
i do agree somewhat with anthems theory on cycling, but we do differ in opinions on how to cycle(but differences in opinions do vary in this hobby), probably neither of us are completely wrong, there are many others who too have skimmed and changed h20 in the cycle just as there are others who have not, but IMO, most of the people who come looking because after months their tanks wont cycle are those who did the above mentioned things