That is a flat worm for sure. (forked tail is a dead giveaway)
I had a few of them squish them against the glass or try to pick them out. If you get too many they can be a problem.
Your tank will go through different algae stages as it matures. I would agree with michika it does not look like hair algae pull it out as best as you can a bit more time and you will run into the next stage. As your tank gets more mature it should go away as long as the rest of your parameters are ok.
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150 Gal system 3'x3' 400W M/H, Bekett skimmer, Dart return,1/4 HP Chiller
180 Gal Drop tank, LED lights, Bubble master 250 skimmer,Hammerhead on a closed loop, Speed wave return.
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