New tank / new fish adding compatibility question

[monza]

I had a plan of adding a couple of new fish to my new tank which will be 250 g.

The fish in my existing established tank that will be moving in are:
Purple Tang
Powder Blue Tang
Regal Tang
Tomato Clown

I have tried in the past to add a small fish or two to the old system at seperate times 2 Firefish-Purple, Banggai Cardinalfish. That did not go very well I had to get them out rather quickly before they got ripped apart. That was a couple of years ago. I did learn from my lesson and new it would be pretty much impossible to add new tank mates.

My theory was since I was upgrading to a bigger tank I could add a few fish before I add the older fish to the system. After reading a post in a other compatibitity thread I have to question that plan.

I have in a quarantine tank right now a Ruby Head Fairy Wrasse (Cirrhirus cyanopleura) and a Flame Hawkfish (Neocirrhitus armatus) The plan is to transfer coral, rock and water to the new tank add the new fish then add the old fish in a short time frame. I also have the Firefish that has been living in my sump/ref. that I was hoping to add.

Is this going to work? Are the tangs and clown going to turn them into fish food. The tank will contain lots of rock and lots of hidding places.

Thanks
Dave