Need a few opinons

So I currently have a 75 Gallon Reef Aquarium, Coral Life Skimmer, Rapid LED For Lighting, 20 Gallon Long Refugium, 4 Power heads on a Wavemaker, Phosphate Reactor.



2 Plat Clowns

1 Lawnmower Blenny

1 Hector Goby

1 Rabbit FoxFace

1 Fuzzy Dwarf Lion

1 Elegance Coral

1 1 Bubble Tip Anemone

Assorted Colony of Zoas, Gods of War, Eagle Eye, John Deer, Blue Hornets and a few others I can't think of.



So my future wife (wedding is October) wanted a bigger tank for her turtles(Red Ear Slider and Yellow Belly Slider). They are currently in a 30 Gallon aquarium and out grew it (started the size of a half dollar).



So we talked and came to the conclusion why buy another Reef ready 75 gallon aquarium for me to modify it to make it work for the turtles.



She said why not upgrade your 75 gallon peninsula tank and upgrade it to a bigger tank. Take the 75 gallon and modify it for the turtles and maybe use the 30 gallon for a new refugium.



Only thing is I didn't want to have to buy any new lighting since my Rapid LED system is only a year old.



So with all the being said.....



I just purchased a 120 Gallon Reef Aquarium (non peninsula) and a Reef Octopus Classic 160 INT (thinking about exchanging)



So my dilema is should I start the 120 Gallon from scratch?

-New Live Rock

-All new water

Then transfer my fish, corals, and lights over?



Should I exchange my Reef Octopus Classic 160INT Protien Skimmer for a Reef Octopus Diablo XS200?



Should I just use the 30 Gallon as a sump (no refugium) or use my 20 gallon refugium I already have made.



Reason I'm leaning toward a refugium is because I wanted to add some mangroves to it.



Any opinions welcome.