I'm of the wait a couple months before adding fish group
. Not because it's cruel to cycle with fish so much as it gives the tank time to grow a good pod and worm population. Fish are predators and even herbivors will snap up any pod that dares show it's face in the daytime.
That said I know how hard it is to wait, especially if you have family hanging over your shoulder saying "why do you have a fish tank with no fish in it"
.
So if you really want to add fish I'd say go for it just add them one at a time and make sure they are small and wait at least 2 weeks before adding the next