If you wanna by pass the uglies on dry rock here is my suggestion and it’s never failed me! Give the rock a muratic acid bath for a hour or so “plenty of threads how to do it” rinse it well and let it dry out over night and add it to the tank with the live rock and it will be purple in 6-8 weeks without ever seeing any uglies! I’ve done this on my current display with about 150 pounds and not a spec of algae!