Brown Algae Covering Live Rock

Hi all,

I recently sort of abandoned my reef tank. The onlything circulating
(and poorly) was a pump. A clown fish was thriving however.

Even the Protein Skimmer was off. Anyway, the fish must of died
because one fine day I saw that the tank was just black, and the
stench was just unbearable.

I cleaned one of the pumps, and put the PS to work. Over several days,
the odor was gone, the water was clear, but there is this brown
feathery algae all over my tank and rocks.

Any ideas of how to remove this stuff without harming the coral algae
underneath? Also, I don't see a single worm, critter, et cetera. Is it
possible this process wiped out the microflora that was seen in the
past? How shoudl I replace them?

TIA for your responses.

Richie