When to add crypts?

I'm now a month into the life of my reborn 80-gallon tank (a 
Dupla/Booth product).  Ideas for rearraging and adding plants 
are starting to percolate through my brain.  Among others, I'm 
thing about adding about half a dozen red crypt wendtii.  The 
Optimium Aquarium recommends avoiding crypts until the 3-month 
point, and I'd like to hear what others feel about this 
(especially you, Karen).

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