Yes you can. But there are several things to keep in mind. First off if it will all fit. Plumb and setup your 75G. Match the water parameters like SG, PH, and temperature of both systems as best you can. Then just transfer everything over as fast as you can. What will kill this process is if you bring or expose too much nutrients for the system to process, which is normally held in a ditritus loaded sand bed or from die off on the live rock during transfer. If live rock has a something like a large amount of oxygen sensitive sponges growing on it a transfer that exposes them to oxygen could lead to a later die off that pollutes your tank. Or if the rock simply gets to cold it can be very bad.
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