20 gallon sump

multiple Q's................would building a sump for a 20 gallon tank even be worth it? it's my QTank, why do I have LOTS of coraline growth in there? All I have is 1 regular flouresent bulb.......and my main tank hardly has any.......I did use PareGuard in it would that have anything to do with it?..........maby I should turn the 20 into the reef, and the 55 into the QTank.............LOL, Just kidding
 
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