I say if all goes well in that six months of having fish without a bunch of ammonia or nitrite spikes, that kind of thing, it would be better than putting one in right off the bat.
I don't claim to be any kind of expert at this, but just from what I've observed in my own tanks and doing lots of reading on the subject it's what I've determined. They're such beautiful and active fish it's a shame to hear of so many of them dying of DGD.