I'm upgrading from a 125l tank to a 350l main tank with 150l sump. I'm changing from sand to gravel. The gravel is already in and the water is in with all equipment running. Can I just buy more live rock, put the live rock from my old tank in the new tank, put all of the sand in a compartment in the sump and move everything over? Or, do I have to start the whole process again?
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