How long has your tank been set up?
You can scoop some but probably the easiest way is to syphon it out with water changes. Maybe take it out over a month or so with about 1/4 each time. Or else you can take everything, rocks, fish, coral, water etc. out and then use a wet dry vacume to take it all out then add your water, rocks, sand and fish and corals back in.
If your tank has been set up for a while watch out for a cycle with disturbing the sand/gravel bed like that.
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