Quick advice : Avoid the Yellowtail Damsel. They are mean.
Regarding reef angel:
Good product. I have used one as well.
The main controller has 2 ports for LED included. That is usually enough for whites + blues.
You only need to buy the expansion if you need more LED pins.
For power-heads, if you want fancy control, yes, that is extra, as it is on almost all controllers.
If you just plug them in to the relay box, you are set as-is.
So not false advertising, but yes, confusing.
On the plus side : You can even download the schematics and source code, so you know exactly
what you are getting.
I am glad you are worrying about quake issues. Lots of people ignore that issue.
Interestingly, there are differences of opinions on how best to secure them.
Plus best method may vary if you have glass or acrylic.
Some say to solidly bolt the stand to the wall, and have a lip around the bottom of the stand.
Others say to make a strong stand, but keep it loose, so it can flex and move.