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Gröen Lake, Härryda, Sweden

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Sweden, Västra Götaland, Härryda

This small 60L aquarium is set to immediate shore under a boat jetty. Between the reeds and in a small sink, the Roach are finding shelter. Using only a limited number of materials I tried to mimic the serenity and tranquility I feel when sitting on a jetty in the Gröen lake on a rainy day.

Submitted by
Martin Kronvall
GPS
57.6794662, 12.2059860
Geographical region
Northern Europe
Drainage Basin
River catchment
Water body type
Lake
Water body name
Gröen
Water body part
Water body course
Water body: tributary of
Tributary name

Videos above and below water


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Water Chemistry

Water information

Water type
fresh-water
Water color
Black water
Water transparency
Low
Concentration of sediments
Medium
Water temperature
20 °C
Water flow/curent
Slow

Chemical parameters

pH
8
Conductivity
GH
dGH
KH
dKH
Dissolved Oxygen

Aquarium information

Aquarium description

Set-up date
March, 2023
Aquarium decoration

Since the aim is a very sparse looking view the hardscape made up of a sand substrate with a fraction of 0.5-2.0mm mixed with semi decomposed leafs and small twigs from the same type of trees surrounding the Gröen lake. The goal was to try to resemble the underwater look of where the reed growing on the shore line gently extends its presence into the shallow water.

The only plants are therefor some common reed found on site.

Aquarium equipment

Filtration: Eheim Experience 150 with 2L biomedia. Running at somewhat limited flow since the maximum is 500L/hr. To prevent the turbulence in the substrate the input/output is situated high at opposite sides. I find this helps aeration but I also use an airstone powered by a Sera 150 airpump.

No heater. LED attachable 5W lamp on timer.

Fish care

Inhabitants are fed a varied diet consisting of chopped earthworms, flake food with a high content of vegetabilies, live daphnias and black mosquito larvas. Care is taken to ensure a high level of airation. Fish are fed small amounts of a mixed diet 1-2 times daily.

The fish are growing at an alarming rate and have more than trippled in size since the past 6 months hence I will be dismantling the tank in the near future.

Fishlist:

  • Rutilus rutilus (Cyprinidae) – 3

Wetland plants:

  • Phragmites australis (Poaceae)
Plant care

No special care is taken other than simulating day/night with light on timer.

Water care

Water changes 10% are conducted 2 times per week with collected rain-water. The aquarium is situated in a air controlled room keeping roughly 15-20°C depending of outside temperature. Decomposed leaves are exchanged when needed.

Dimensions

Length
60 cm
Depth
30 cm
High
33 cm
Volume
60 L

Substrate in aquarium

Sand
Reddish
Pebble/Gravel
Mixed
Stone
None
Stone form
Silt/Mud
Leaves
Few
Driftwood
None
Submerged terrestrial vegetation
Yes