Well to be precise they can very from 4 inch to 8 inch depending on what species of bristle nose you get. There are around 60 species in total. They do best kept at temperature around 23 - 26 degrees c. Excellent in community tanks as they are peaceful and minimum tank size is 20 gallons. L number will depend on what species you go for and a male will grow at a quicker rate than a female
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