Hello Derek,
I have looked at your many other threads. Your tank is doing very well at 4 months. Coralline algae, that’s the good stuff, grows in more colors than pink. It looks like you have two colors of coralline algae on your rock.
A word of caution about hermit crabs, they are voracious opportunist & carnivore. They will wear your snails shells as hats after they consume your snails one by one.
Enjoy the trip.