by specifically running a tank so clean no clouding results from the work done inside. or, you clean the tank (the sandbed full of clouding waste) correctly before you do the tank handling.
if you choose not to run a clean system and still do in-tank work that kicks up waste, look what can happen:
I have a stable, successful (by my standards) tank for many years. I has a dsb which may or may not be relevant to that. Seems like all I read about DSB is anecdotal. So, I will add to it. I had to excavate a small section of my sand bed for a plumbing issue. With in 12 hours, both my tangs...
www.reef2reef.com
contrast that, to this: sixty pages of the roughest tank handling and scape changes on the internet, with not one single loss for nine years (because we cleaned all sandbeds ahead of tank maintenance / scape change time)
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
so, you can see that releasing clouding waste into the tank is the harm, and being 100% free of that waste allows any form of physical handling and changes you want to do. in that thread are nuances: keep your fish covered while they're in holding etc. gotta read up to learn the handling surgical process.
if you truly study the second link, you can see that sandbed rip cleaning allows you to never be invaded, never lose tanks due to handling errors, never hesitate when moving or upgrading a reef tank, and you can change out sandbeds all at once with no recycling...all from just being cloud (waste) free.
you can specifically see in the contrast between the two threads an enduring irony:
-handling things partially, such as the sand alone in an attempt to remove the 'least' bacteria or cause the least system upset via changes has 100% of the loss examples. that first link is one of ten I have.
-handling the tank 100% all at once, via surgery (so that sensitive animals can be removed away from the clouding) shows that we don't lose critical bacteria, and no system upset happens.
is a human mouth better or worse after going to a dentist for a mouth rip clean? it's not true that leaving waste in place is the safe option in dentistry or in reefing.
of course thousands of people handle their scape changes and bed handling without taking the tank down, every so often one of the systems dies. If I killed someone's system in my work thread I'd stop running it and have it removed. in order to gain perfect results when advising tank handling, there is only one safe method on the entire internet.