I let mine go for 30 days before i added any CUC. Then it was 3 tiny blue legs and two astrea snails.
After my cycle which took about 45 days i added my first two fish...pair of juvenile clowns.
Even after 45 days, it was still ugly and got uglier. went thru a diatoms, hair & dino.
One day around 90 days it just started looking better but that was slowly adding the CUC and resisting every fiber in my being to add more fish.
Now its all good and i have 4 fish, 2 shrimp and a diversified CUC.
I'm not suggesting either way but if you do add now, it should be focused on smaller things that will work the rock and sand to augment your cleaning/water changes