Fallen tree in Igarapé do Daracua, Rio Negro, Brazil

_th place in Biotope Aquarium Design Contest 2020

Volume: 144 L
Dimensions: 60x60x40 cm
List of fishes: Nannostomus eques, N. unifasciatus, Paracheirodon axelrodi
List of plants: Eleocharis sp. and Hygrophila sp.
Description of decorations: The substrate consists of part sand and part peat. A few small pebbles are scattered around the sand. The wood is driftwood.
Description of equipment: JBL e702, 2x 6w led strips and a 15w floodlight. Superfish 100w heater
Water parameters: Temperature is 27 degrees Celsius, pH is 5,0. TDS is 67.

Additional info: Given it’s mostly RO water, water changes are small in order to keep stability.


Description of the area surrounding the biotope: Igarape do Daracua is an igarapé near the rio Negro, at about an hour per boat from Barcelos.

Description of the underwater landscape of the biotope: The biotope is filled with biofilm and all sorts of plant matter.

Description of the parameters of the habitat: Water is dark, the temperature is high, at about 27 degrees Celsius. The water is very acidic, at a pH of around 4,5  and the conductivity is very low.

List of fishes and invertebrates occurring in the nature biotope: Apistogramma sp., Dicrossus filamentosus, Paracheirodon axelrodi, Nannostomus eques, Nannostomus unifasciatus, several Hyphessobrycon species.

List of plants found in the nature biotope: Hygrophilla sp., Eleocharis spp., sprouts from trees surrounding the water.

Threats to the ecology: As most habitats in Brazil, this biotope is in danger because of exploitation of land. The rainforest surrounding the biotope is burnt down and used to cultivate soy, or used for mining gold.

Sources of information:



Comments of the members of the jury of Biotope Aquarium Design Contest 2020