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IMO only... I guess it matters on how often you would like to upgrade your tank depending on the size on the fish. If you are able to supply a larger tank as the fish grows then you might be able to start small as I did. I found myself that I ran into issues with the high input/output of these Trigger fish, they eat a lot and they dont whipe well...
I started with a 48 gallon tank with a HOB pro-skimmer, 40ish lbs of live rock and a sand bed. BUT I did not want a bunch of fish, as a matter of fact I wanted one... a Undulated Trigger. I made up my mind that would be the only fish in the tank. I soon found water changes needed to become bi-weekly, and the skimmer itself would not cut the cleaning bill. I bought a Fluval 404 which was way overkill for the size of the tank, but it helped clean 300%
I bought the trigger very small... maybe 3 inches including tail and fins. About a year later I upgraded to a 75 gallon, and kept all the same equipment. The trigger is now about 5" and has a 125 being cycled as we speak. I have added another fish with the trigger since then and that is a Flag Tail Grouper that is about the same size.
I do believe by the tank being so small to start it caused the Undy to grow slower maybe due to tank size or stress from not getting the swimming it needs or both.
The cool thing is you are going about it the right way... ask, let some people give you feed back, and make your move... and always remember salt is to fresh as chess is to checkers!
Best of luck and happy new year!
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