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For starters, you shouldn't cycle with a fish. It's terribly stressful and you will likely lose the fish. It can take weeks to cycle with live rock, and if you add it after you've added fish, you'll cause a spike in the tank and start a mini-cycle.
I just set up my 75 for salt, will be adding rock in the next few weeks, and I likely won't add fish for 2-3 months after that. See if you can take the fish back and start over with some research. I've spent hours reading and I'm just scraping the surface and could only tell you where to begin. Salt, live sand/rock, protein skimmer, powerheads 20x flow of the tank size (so minimum 600gph for you). I hope someone with more experience will jump in, but you're off to kind of a shaky start.
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