That's an admirable and quite amazing transformation, over two years.
The up grade will really give your corals room to get huge.
When I was a kid, I used to love a product called magic rocks. You'd add these colored crystals to a container with some provided liquid and in a couple days, you'd have all of these colored stalagtites growing up towards the surface.
Your 2 year progression looks exactly like what would happen in 2 days with magic rocks..
The magic rocks were a wee bit easier to grow, however.
I'm sure it's one of the reasons I fell in love with this hobby..
It's always so amazing and rewarding to look at the outcome..... A bit more rewarding with a reef, than with the magic rocks, though.
Very nice job.