a couple of questions

[Kennetht]

I was looking at a reef tank at a customers business today, and noticed an acro frag that had a brown base, and was green and white on the main parts....is this coral supposed to turn white, or is it dying? Next question....I have a nice "bunch" of green star polyps, that is being overtaken by hair algae...how can I get the algae off without damaging the coral? Thanks in advance for the help.

[Fant]

White is usually not a healthy color for acros. star polyps are pretty touch just pull it off