i'm just curious, why can't he just add the laterite and do lots of water changes.
don't know if it will help, but when i had to add more flourite (or laterite i don't remember which anymore) to one of my tanks, i washed it lightly and put it into a giant ziplock bag that i lowered into the tank and then poured out the deep as possible. it did not cloud much in my opinion, nothing a canister full of filter floss didn't take care of. results may vary though and it's time consuming for a large tank.
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