Okay, all kidding aside for the moment. Duckweed has a bad rap, an undeserved rap. It is not the pestilence that many believe it to be and it can be eradicated with a diligent effort. It can get out of control if you let it but so can Convict Cichlids. Every aquarium has periodic maintenance and if you like duckweed but don’t want it covering the waters surface completely then you scoop some out with a net every so often. It’s just that simple.