the irony is that what causes the crash/mini cycle is opposite of what we used to be taught
regardless of the age of the tank we should clean them, since cleaning is shown above to be restorative vs harmful in any way. 4 mos or in my case a 14 yr old system cleaned for the fourth time just to join the fun on the last page.
I love it when reef truths have to be reversed to get good results.
the bacteria still stick to any surface we rinse is the trick. reef surfaces are too rough, grippy, to let go of bioslicks just because we ran some cool tap water across the grains to evacuate all forms of clouding: harmless new sand silt or aged-bed mixed waste proteins in various stages of decay, those are dangerous to upwell and are also great invader feed.
If deep cleaning a reef is harmful, ever, then we'd want to save that as last resort.
but if its helpful, regenerative, unclogging, oxygen-boosting, ORP-resetting, waste-evacuating, precision invader removal access and lifespan-boosting, we'd want to do it at the first possible interval, and repeat whenev.
*if someone has a picture of an awesome, undisturbed reef to show why not rinsing is best that's going to be a nice looking tank agreed. this is a move transfer, with risk, and taking detritus out of the move equation is total control of risk. I have grown to like the looks of a clean bed but knurly, coral-topped rocks above it full of coralline and not green hair algae. post-rinse reefs show the strongest coral extension the keepers have seen we can see in feedback and pics.