Upgrading my tank from a 75 gallon to a 165 gallon and a 100 gallon sump.I would like to just add new water to what i have but dont know if i will get a cycle or if the rays would be ok.I am only gonna use the little bit of substrate i have in the tank now.May add some more later.And i also plan on running the canister filter that is on the tank on the new tank for a few months till the new media and stuff get bacteria grown on it.