Best way :o

I have 180G tank and 50G sump. I wonder what will be better way to get the cycle asap, mixing all the water or mix 100G and use the rest sea water from pet store?


Will have refigium with macro algie,canister filter (fluval fx6) and reactors (pallets,GFO and carbon) skeemer and 50lbs dry rock and 20lbs curede live rock to seed the other rock