"Don't confuse receeding with dying."
well, considering none of the algae that came with the rock ever regrew after the rock cured.....i'd say it died...yup....died.
"The ONLY way algae can grow there is if it is there.
Don't you agree?"
uuhhh, nope.
no, i can set-up a new tank with nothing but aquarium gravel, some salt mix and light and i'd get algae......