based on those pics the floc will happen a week or so and then likely settle if you have some sort of catchment in place like a sponge or some biomedia in the back that trap waste and is cleaned.
if the system is pretty closed to particle export then the circulation of the silt w continue a while/undecided end point.
pre rinsing of bagged sand whether wet or dry removes this headache in all cases where the sand wasn't the tiniest oolite fraction, this above is typical reef sand its not oolite. pre rinsing would have helped here.
it doesnt look bad at all in pics, what you're seeing is the small details only views in person can notice. very nice reef.
not that you'd want to do it, but we have fifty pages here of redoing that type of job above and making a perfectly cloudless reef in about two hours. nobody says you have to entertain any clouding at all, if you don't want to
its terribly easy to take apart that reef, tap rinse the whole sandbed to perfection, final rinse in ro, then set rocks back on top and refill. it will not cause a cycle, it causes awesomeness its how we're up to fifty pages.
if you want to redo your sand vs add it to a prior uncleaned area, we specialize in that. your reef can be perfect ready in 2-three hours.
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
you could drain off most of your water and hold as re use, it doesnt have to be all new water going back in the re built tank.
if you think the goby is about to stay busy, then consider copying what we do there and you'll get the same results.
