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As far as I know, rinsing only makes a difference if the substrate is seeded. I rinsed and used a pvc pipe to the bottom of the tank and a 4”-2” reduction to sort create a funnel. Worked pretty well. Could aim deposits as needed. Minimal dust and disturbance.
Adding it slowly is the best way to do about everything in this hobby, but I’ve seen people change a whole 8” cylinder of calcium reactor media (including myself) w/o much issues. It will stop growth for a bit and nutrients become less stable, but after it settles in it’s good to go.
One time I removed an entire sandbed via siphoning in one day w/o much issues. There was obviously a destabilizing event, but nothing died.