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In a new tank you may want to wait 2 weeks or more between fish. I know its hard to do but will be best for the tank and fish..
A lot of people recomend that you QT your fish for 3+ weeks before adding to the tank.
Agree as well, but it also depends on the amount of live rock, if any, in your tank. If you have a heavy bio filter (a lot of rock-live that is) you can go week to week adding fish. Otherwise rely on your test kits.
I was told wait 2 weeks between adding fish. I have had my set up for about 6 months and only have two fish in it right now though. Patience is key in this hobby.