That number of fish in a 150 is not a problem IMO, but you should upgrade your skimmer, and look into adding a fuge and/or UV.
Since adding my fuge, upgrading my skimmer, and adding a UV sterilizer my tank has almost no slime aglae growth on the glass at all, I haven't used my magnet in a long while. In fact my coralline algae growth is more substantial than my green slime on my front glass.
I added these at different times. My skimmer upgrade improved my water quality to allow me to have LPS and SPS successfully, but my softies growth slowed down substantially.
My fuge with various macro algae has out-competed my hair algae in the display with is great.
My UV has cleared up my green slime amazingly well.
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