Crossword Genius

Fish tank buildup (5)

Ross

I believe the answer is:

algae

<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">fish tank buildup</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is all the clue.<br/ ></span>

(Other definitions for algae that I've seen before include "Simple plants, such as plankton" , "Water plants with no true stems or leaves" , "Seaweeds etc" , "Water plants seen in a gale" , "Marine growths" .)

I've seen this clue in The Washington Post, the Family Time, the L.A. Times Daily, the USA Today, the Jonesin', the Universal and The New York Times.
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