bam Demanding level

River Bank, Rio Demini, Amazonas, Brazil

Sponsored by

Brazil, Amazonas, Barcelos

The 250L aquarium represents a fraction of a natural river bank from Rio Demini, an middle affluent of Rio Negro. The river banks in Rio Demini are formed of many terrestrial plants, with roots, branches and leaves going in water, giving the river the water the typical brownish shade. Here, on the banks of the river, among branches and leaves, many species of small fish find shelter, including Nannostomus trifasciatus.

Submitted by
Andrea Gollin
Approved by
Roberto E. Reis, Pablo C. Lehmann and Flávio Lima
-0.1759183, -62.7900314
Geographical region
South America
Drainage Basin
River banks
River catchment
Rio Demini
Water body type
Water body name
River bank of Rio Demini
Water body part
Flood plain
Water body course
Middle course
Water body: tributary of
Tributary name
Rio Negro

Videos above and below water

Water Chemistry

Water information

Water type
Fresh water
Water color
Black water
Water transparency
Concentration of sediments
Water temperature
27 °C
Water flow/curent

Chemical parameters

Dissolved Oxygen

Aquarium information

Aquarium description

Set-up date
march 2023
Aquarium decoration

The substrate used is Amtra sand sugar size amber color. On top of it the leaves liter is composed with leaves from many terrestrial plant, such as: guava, cacao, banana (stripes of leaves). Some botanicals offer repair to fish, there are 2 buddha nuts, a badam nut, a cacao pod and a canoihan pod.

Between pods and leaves there are some dried Muehlenbeckia sp. branches. The back panel is made of polystyrene with cocoa and sphagnum moss. Different branches drop into the water. In the background of the terrestrial plants live, like in a river bank, Monstera deliciosa, Ficus sp., Marcgravia sp.

Aquarium equipment
  • Filtration: Ferplast Bluextreme 1500 used to make the waterfall.
  • Waterpump: Jebao SCP-120M.
Fish care

The aquarium recreates a bank of Rio Demini, with the slow flow of water that goes from right to left, thanks to the double bottom of the tank. The flow is not continuous, thanks to the wavemaker pump settings it is possible to mimic the different flow of the flow as in nature. The waterfall waters the plants and supplies a lot of oxygen into the water.

Botanical leaves and nuts provide excellent hiding places for Nannostomus trifasciatus. This species lives close to the shore, where it can find food and shelf, as recreated by the background and branches.

Plant care

The plants take water from the tank above and from the waterfall. Sometimes I mist them.

Water care

The water is daily checked with conductivimeter and I do a water changes with pure RO water whenever the conductivity raise above 150 microsiemens. The glass are cleaned with a razor every week.


100 cm
50 cm
50 cm
250 L

Substrate in aquarium

Stone form
Submerged terrestrial vegetation


Comment by the expert

Roberto E. Reis: Fish and decoration selected properly, with very beautiful and creative background simulating the river bank. The aquarium looks beautiful and balanced, but the only one video presented mixing the BIN and the aquarium. Description of tank and external resources reasonable.

Flávio Lima: It is a very beautiful reconstruction, although including a sole fish species. The participant included only Nannostomus trifasciatus, but in the video provided the Nannostomus species present is rather Nannostomus marginatus.

Pablo C. Lehmann: In summary, the information provided about Morichals in the South American llanos offers valuable information about this unique ecosystem. However, it would have been interesting to have included other sources of consultation, perhaps a video of the natural environment and more detailed descriptions of the fish and plant species, the habitat and perhaps including more information on local threats to the natural ecosystem.