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It is tough to cal. If no frag bag bring something to carry it back in. It's cold in NJ today too. I have a small styrofoam cooler and a small bucket to carry stuff, plus a frag bag.
The rock will displace water and so will sand.
Make 40-50 gallons of new water for the tank at least or make it all 75g. Make sure salinity and temp are similar to old tank.
Move fish/coral into buckets/containers and then take out rock and setup in new tank.
Water from old tank can be used to...
I could be wrong but sounds like sand was not well rinsed. I would just get some floss or pads and just keep swapping out frequently until it clears. If it settles and you add coral, fish etc. It could start all over.