Species name: Carassius auratus
Common names: Ryukin Goldfish
Family: Cyprinidae
Order: Cypriniformes
Class: Actinopterygii (ray-finned fishes)
Maximum length: 12 in (30 cm).
Minimum tank size: 50 gallon for an adult specimen

Species name: Archocentrus Nigrofasciatus
Common names: Convict Cichlid, zebra cichlids
Family: Cichlidae
Subfamily: Cichlasomatinae
Order: Perciformes
Class: Actinopterygii
Maximum length: 3.9 inch (10 cm)
Minimum tank size: 20 gallons

In our effort at keeping algae away from our tanks, algae eaters can be great allies. Here is a short list of some of the best algae eaters I know. If you know any other fish or invertebrates that should be added to this list or would like to add some information to this list, please use the comment box bellow. Thanks!

Description
Blue Green Algae (BGA) has nothing to do with other types of algae usually found in aquarium. This unsightly and potentially hazardous primitive life-form is notoriously hard to get rid of and is the bane of many an aquarist.

Image by Kai Schreiber

Description
Black Brush Algae is a form of red algae (Rhodophytes) in the genus Audouinella. While most Red Algae only thrive in saltwater conditions, a few of them have adapted to freshwater conditions and the Black Brush Algae is one of them.