Subject: Unidentifiable Semi-aquatic Insect
Location: Fish tank in Denver Colorado.
February 11, 2016 5:46 pm
These small black insects are sluggish out of the water but very fast on the surface tension of the fish tank. They seem to be very successful in reproducing as the colony is fairly large 100-200+. They appeared in a cichlid tank, on the moist lid and rim of the inner tank. The parameters of the tank match that of Lake Tanganyika, the tank is hooded so air circulation is null. They are no more than a CM to a CM and a half. They are very fragile. The images were taken with a 60X microscope. The home in which they appeared is in Denver, Colorado. Mid-winter, in a 74-72 degree indoor environment.
These are Springtails in the Class Collembola, and they are benign creatures that can become a nuisance indoors if they are plentiful. They thrive in moist environments, so the aquarium is a perfect habitat for them. See BugGuide for more information on Springtails.