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Rio Poranga, São Gabriel da Cachoeira

Sponsored by

Brazil, Amazonas, São Gabriel da Cachoeira

The aquarium shows the habitat of the Corydoras duplicareus in their native Rio Poranga river near the shore.

Characteristic of this place, as you can see in the attached nature video in BIN, is the sandy substrate with different levels of overlapping pieces of wood, branches and roots. Small water roots hanging from the water and larger tree roots provide many hiding places for fish.

As it is a coastal area, the plants Eleocharis acicularis and Echinodorus grisebachii are found here. The leaves of tropical trees and palms lie where they naturally fell, some stuck to the roots and others to the bottom.

It is a black water aquarium, however, like in nature, the water is quite transparent. The parameters of the water in the aquarium are similar to the natural environment, the lighting imitates the sun’s rays penetrating the trees.

Submitted by
Magdalena Szubska
Approved by
Heiko Blessin & Nathan K. Lujan
GPS
1.1261111, -66.8505020
Geographical region
South America
Drainage Basin
Rio Negro
River catchment
Rio Poranga
Water body type
River
Water body name
Rio Poranga
Water body part
Water body course
Middle course
Water body: tributary of
River
Tributary name
Rio Negro

Videos above and below water

Water Chemistry

Water information

Water type
Fresh water
Water color
Black water
Water transparency
Medium
Concentration of sediments
Medium
Water temperature
26 °C
Water flow/curent
Strong

Chemical parameters

pH
6.0
Conductivity
38
GH
6 mg/l
KH
3 mg/l
Dissolved Oxygen
40 %

Aquarium information

Aquarium description

Set-up date
May 2020
Aquarium decoration

The found root branches and wood were used to build arrangements in the aquarium, which were specially arranged differently to create a gradual slope of the terrain. The substrate was sprinkled with river sand purchased in an aquarium store.

Larger and smaller (personally found) dark roots imitating the sunken roots of tropical trees and shrubs growing along the riverbank served as an additional decoration. The effect of a naturally silted bottom was created by applying a small amount of crushed roots and dried leaves, which were gently sprinkled on the surface after cooking, and then everything settled to the bottom, and over time the desired natural effect was obtained. All elements of the aquarium decor have been properly cleaned and heat treated to keep the fish safe.

The whole thing is to imitate the shoreline of a tropical river with tree roots and plants. A matte self-adhesive foil was used to make the background, and then a beige cardboard approximately 1 cm away in the color of a paper eco bag, which was additionally highlighted with RGB tape.

In the space between the back glass and the cardboard attached to the wall, the roots are placed at the top, and the dry grass at the bottom. This is to mimic the depth of the aquatic landscape. This technique has been called “Deep shadow”.

Aquarium equipment

Filtration: JBL CristalProfi e1901 greenline – 1900l/h.
15l bucket divided into 5 baskets with media, one is a protective sponge, the other four are ceramics, which creates a complete biological division in the filter.

The primary lighting is Aquatlantis Easy LED Freshwater, 1047mm, 6800°K-52w Eady Led Control, which simulates the natural and gradual effects of sunrise and sunset. I also use an additional 4000K-10W LED lamp with warm light that mimics the sun’s rays. The blue background behind the aquarium is lit by a strip of white RGB LEDs.

Hardware descriptions: Filtration: JBL CristalProfi e1901 greenline – 1900l/h. 15l bucket divided into 5 baskets with media, one is a protective sponge, the other four are ceramics, which creates a full biological division in the filter. The primary lighting is Aquatlantis Easy LED Freshwater, 1047mm, 6800°K-52w Eady Led Control, which simulates the natural and gradual effects of sunrise and sunset. I also use an additional 4000K-10W LED lamp with warm light that mimics the sun’s rays. The beige background behind the aquarium is illuminated by a strip of several white RGB LEDs.

Fish care

The fine-grained sandy substrate used is ideal for the species Corydoras duplicareus. Decorations with small and larger roots provide shelter for the fish.

All branches and dried leaves are useful additives that, in particular, result in the formation of microbial colonies during their decomposition. Such microorganisms can provide a valuable secondary food source for fry, while tannins and other chemicals released by decaying leaves are also believed to be beneficial and help simulate natural conditions.

The filtration is adapted to the fish, the water flows quite strongly but high just below the surface, moving the surface and oxygenating the water in the aquarium.

The fish boldly forage throughout the aquarium and clean up most of the pollutants. They get all kinds of food, from dried drowners with probiotics to small frozen varieties of larvae. A varied diet will keep your fish in optimal condition. The number of fish is optimally adapted to the place in the aquarium, there is also room for new ones for the fry.

Plant care

Plants in the aquarium have selected water parameters and lighting similar to natural. Eleocharis acicularis grows profusely in the open here and is not shaded by decorations and other plants. The roots of this plant colonize well in the substrate, creating beautiful grassy clumps 6-15 cm high.

Echinodorus grisebachii also grows healthily, reaching a height of about 10 cm. Since setting up the aquarium, they have developed an extensive root system in the substrate. They easily reproduce vegetatively here, creating new plants on long shoots of inflorescences growing from the rosette.

Water care

The water in the aquarium is replaced at 20% every 10 days. Bacteria are also added with each water change.

Dimensions

Length
140 cm
Depth
60 cm
High
60 cm
Volume
500 L

Substrate in aquarium

Sand
Beige
Pebble/Gravel
Stone
Stone form
Silt/Mud
Leaves
Many
Driftwood
Many
Submerged terrestrial vegetation
No

Bibliography

  • Freshwater and Marine Aquarium 18(7), 1995 - Four new Corydoras (Callichthyidae) species from Upper Negro River tributaries and a range extension, together with a discussion of C. bicolor Nijssen & Isbrücker. by Sands, D. D.
  • Verlag A.C.S. GmbH, 2005 - 1-384 Identifying Corydoradinae Catfish. by Fuller, I. A. M., and H-G. Evers

Comment by the expert

Heiko Blessin: Phantastic! The tank has been decorated according to the nature but: Try to arange it more beautiful! This is the real challange of biotoping: Copying the nature but make it looking really nice. I know this is very tricky but in most cases, it is possible! 

Nathan K. Lujan: The biotope aquarium is an excellent facsimile of the natural habitat. My one criticism is the focus on only a single fish species. It would have been nice to see a fuller representation of the diversity of fishes in this habitat, especially midwater and topwater tetras, cichlids, and other catfishes.