brown algae
algae needs a few things to grow
First is light which you r going to have plenty of in a reef
the second is nutrient( detritus)
too much food, that settles to the bottom
the third is when there is not enough flow
you also said you got water your freinds tank, not alway as good as it sounds
you do not know the makeup of his water. the nitrate and such
Do a good water change. but expect some algae
another factor is the age of the bulbs, old bulbs cause algae
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