How many powerheads and change to live sand?

Hi. I have 2 questions in which hopefully you can steer me into the right direction. 1st, in my FOWLR tank w/125 of l/r I currently use 2 powerheads for circulation at the opposite top ends.

Would adding 2 more rated at 250gph be beneficial or would this be overkill? It currently houses a clown wrasse, a tomato clown and the guy who seems to enjoy the movement the most, a palette tang. Second, in about 4 months I'm going to move the tank (60 ft) which currently has c/coral.

This would be the time to switch to live sand if better. I always find myself after a w/change saving 1 or 2 creatures from the tub (usually brittle stars and worms) and tossing them back into the tank. If I see them I save them.

If I switch over to sand these little guys are destined for the big "flush". More.

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