Hello all. I am new here and an owner of a 15'x48'' intex ultraframe pool. We've had no problems all summer until the other day I noticed some yellowish/orange/brown stuff accumulating around the edges of the pool bottom. I assumed it was algae (mustard algae b/c of the color?) so I shocked the pool last night, scrubbed with a brush, and added algaecide this morning. The algaecide I bought was Aquachem 50%. I noticed, after I added it of course, that is says "kills GREEN algae". Should I purchase their Algaecide PLUS which says it kills green, mustard, and black algae? Can I add it right away or should I wait? Thanks!