Cool! - Will do some investigating on the cichlids!
I had a look at your photos, and you are right - it's hard to distinguish.
On this photo
: it looks like the white dots are little snails. I can't see any aptasia on your rocks. Aptasia are evil!
Living in Australia, I get all different types of hitchhikers. Someone who has been around longer may need to ID this.
If it were me, I'd wait a little to see if anyone ID's on this thread. At the moment it doesn't look dangerous IMO
. If you do start to get more concerned, take a piece of your rock into your LFS
and see if they can ID. (Bring it in a bucket of saltwater with an airstone).
Here are some links to help you ID:
Hitch Hiker FAQ
Hitch Hikers Guide to the Reef
Sorry I couldn't be more helpful.