UNWANTED ORGANISM IN AN AQUARIUM Crossword Clue
UNWANTED ORGANISM IN AN AQUARIUM Crossword Clue
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                    Crossword Puzzle Infos
                            
                                An unwanted organism in an aquarium is an ALGA, which is a type of plant-like organism that can grow in water. Algae can be beneficial to an aquarium, but too much can cause problems such as blocking light and reducing oxygen levels.