This is my chance to convey something meaningful! Darn. Wasted it.
You did a really great breakdown of a very difficult to explain game! I'll definitely be using your techniques next time I try to teach others.
However, you seem to have interpreted the rules for replenishing of the polyp tiles in step 10 differently to me, and differently to the consensus in this thread (Replenishing reef tiles (3/3/3/2/1)).
From the rule book (my italics):
For each of the five differently colored larva cubes on the open-sea board that is accompanied by fewer than three polyp tiles, add one polyp tile to the space containing that larva cube
Which I interpret to mean you add one tile to each square containing less than three tiles, rather than that number of tiles to the square you just cleared out.
The rule is very poorly worded though, so it's hard to know for sure, but the way I've been playing works nice and smoothly and means that no cube is ever stuck with only one tile.
Thanks for your great podcast. It's an invaluable resource!