do you have enough RSPC to fill the 120?? are you upgrading / moving a tank?? or are you starting fresh??
i find that if you start off with small frequent water changes to not shock the tank you can easily switch salts with no ill effects.
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120S RR tank with 60G basement sump / fuge
Return Pump: Little Giant 4-MDQX SC
Water Movement: Seio 1500, (2) Hydor Koralia 4's
Lighting: 400W SE MH with 14K Aqua Connect
Skimmer: Euro-Reef RS250 with gate valve
Other: RODI, RDSB, PO4 / AC reactor
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