yes its totally easy to do and you don't have to buy anything but new sand. no bottle bac, no Prime, just do a rip cleaning. its this:
drain water out and be catching fish nicely as poss hold in bucket elsewhere
leaving only rocks n coral n water n sand, take out rocks and be rinsing them in the tank water somewhere so the detritus doesn't move to the new tank after setup. *moving cloud, detritus, is the sole risk and no other step is a risk.
rocks are rinsed in saltwater only, corals too if needed, to remove all detritus. swish em around a bit, then hold for rework. no recycle if there is no clouding put back into the new tank.
throw out the sand
whatever new sand you've bought, rinse it with tap water till it runs clear, then salt, then use it all. skip cycle setup. yes tap is the pre rinse, until clear, no it doesn't harm or matter to your sand bac. the rock bacteria are what we preserved, here's 23 pages of the work without fail. If you choose the skip cycle switch out, we will link your work to page 24. tap water never touches your live rock, only the new sand where the bacteria does not matter anyway, the thread below is an in-depth study of microbiology and commanding what tanks do regarding filtration schemes.
The sole risk is you moving over or disturbing filthy waste, which your current bed has and its not good for the system. pre rinse your new sand, we open the thread with examples of non pre rinsing.
The reason what you do with your new sand doesn't matter to filtration stability is the same reason we get away with removing full sandbeds in that thread and not even putting one back. The bac on the live rock is always, always, always enough unless you're using hardly any. Your live rock even if stand alone, instant no sand, can handle double the fish bioloading....that's how much surface area reserve you have independent of sand SA>
If you are reading this thread to cure a tank invasion from a link I sent you, we do not need to identify your type of invasion here we do not need you to test anything at anytime regarding nitrate, phosphate etc Above all, we do not need to see a microscope slide picture of your invasion at...
www.reef2reef.com
The thread is specifically a study on substrate changing. You even have the option of catching and reusing your drained off water above, not having to make new.
in our thread, we start the new tank like a new reef....100% water change. The reason why: gets the most lifespan possible from your reef. conveying any old organics, while popular, isn't ideal since you didn't get to start with totally empty and clean spaces that take in new feed and waste, for new coral mass building.