Am I ready yet?

Hi all,
My tank is about 3 months old. My nitrates are between 5-10ppm.
It's a 75gal w/ 265w PC a 4" DSB and so far I have accumulated 45lbs of
LR. I've recently discovered coralline algae growth!
I know I should wait about a minimum of 6 months to start adding coral.
I am trying to be patient and I am willing to wait.
However, I am curious if there is a "hearty" coral that I could add now.
I do have a couple of LR hitch hikers. One is a red mushroom and the other
is some sort of button pollyp which I recently re-discovered.
If it were not for this experience of the hitch hikers, I probably would
not want to advance to the next level so quickly. Nonetheless, I've got the
itch... BAD!
Any suggestions?

TIA

~Mort