murky water...

[digital-audiophile]

Using fish to cycle is cruel. In a marine tank there is enough die off in live rock (assuming you have enough) to work through your first cycle, or you could put a piece of raw shrimp in your tank to kick start it. If you have not already killed the fish I would hope you take it out and give it a better life.

[Redrover]

I suggest more research is needed
search the internet ie. Reef Tank set up by Marty Ziegler for one
You just can't set a tank up overnight, it takes months
The tank has to cycle first before adding fish or corals
You are getting some bad advice from the fish store