I am only for it if it is the only fish in an established 30 long, about 1-2", and there is another larger tank in another part of the house that you are trying to "grow him in to" because there are somewhat larger fish in it. Meaning, the 30 is a nicely furnished Q tank for awhile. That's about the extent of it, IMO.
I will add that there is actually a big different between a standard 29g tank and a standard 30 - which is a "long" tank. The 30g is a 36" tank and I believe the 29 is only a 24" tank. This is a HUGE difference in swimming space for these guys, as with territorial fish.