Its moving time (advice needed)

[Josh23]

The tank is glass.

I dont know if it makes a difference but its only a 50 gallon with a small foot print 36x16 inches.

If I do go ahead and remove most of the sand can I replace it all without creating a problem. The sand bed is 3 to 4 inches deep and in some locations deeper in the bed there are black areas. Its my understanding that these areas if disturbed can release gasses into the water. Will i have to replace all the sand?

Thanks for all your replys so far. Keep them coming

Josh