Fantastic diving at Überlingen / Lake Constance

The Lake Constance is 395 m above sea level and is, with an area of 536km² and a volume of 48 km³ by far the biggest lake in germany.
The maximum depth is 254 m, the average depthg 90m.
It´s basin was formed by the „Rhine glacier“ during the last ice-age.
During the 1960´s to the 1980´s the Lake Constance got increasingly overfertilised by sewage and nutrient influx.
Due to the construction of numerous sewage and other measures, nutrient levels decreased again. Today, the Lake Constance has gained a good water quality again with nutrient levels of approx. 4,4 mg/l nitrate and 0,018 mg/l phosphate.

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Offshoot Offer Sept. 2014

SUPER AUTUMN OFFER – super offshoot at Super Autumn prices… 

…up to 33% discount (unfortunately only as long as stocks last…)

Pocillopora damicornis “Pink ” from €17.50!

Montipora sp. “Red “/ “Steel blue “/ “beige ” from €9.50!!

Montipora sp. “green” (New!) from €24.50!

Stylophora Pistillata (see picture) only €39!!!

Stylophora pistillata “violett” (see picture) 29 €/34,50 €/39 €!!!

Euphyllia divisa-now from €29 instead of €39

Favites sp. -Now finally ready for sale-from €49.

And of course much more: > 300 offshoots, > 50 types, technique, accessories and Marine Aquaristic Service.

Just arrange your appointment and come by!

Marine Biology Workshop in Marsa Shagra

During our last 3-day workshop, the main topics covered were:
• Coral reef ecology
• fishes of the Red Sea
• plankton and microfauna
• threats to marine ecosystems & marine conservation
The evening presentation on “Coral reef ecology” began with the conditions and pre-requisites of coral reef ecosystems, reef building and erosion. We elaborated on the different types of reefs and their zonation and looked at some of the reasons for this enormous species diversity. Furthermore, we explored the manifold relationships within this ecosystem and the food web, and concluded with a look at the reef’s architects, the corals themselves.

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Fluorescence night dives at Marsa Shagra housereef

All these photographs have been taken during two night dives on the 8th and 10th august at Marsa Shagra together with my buddy Gerhard Kutschera.

After excitation with a blue light torch most corals fluoresced in green light, but also partly in red, orange or blue light. Some fish have fluorescent pigments as well, such as lizard fish (Synodontidae) which appear bright green, or the scorpion fish (Scorpaenidae) which fluoresce partially red. Cyanobacteria mats fluoresce in orange.


Comment: No picture editing other than frames cut!

Fish Workshop in Marsa Shagra


In this 2-day part of the Marine Biology Workshop, we mainly dealt with fish and immersed ourselves in two different reef species:

1. At Marsa Shagra House Reef, a coastal strip interrupted by a natural Bay (Marsa), and

2. On the Elphinstone Reef, a platform reef that lies about 15km offshore of the coast.

On the eve of the evening, the marine biologist Stephan Moldzio had already given a rough overview with the talk about the fishes of the Red Sea.
After an exciting early morning dive on the Elphinstone Reef and a dive at the house reef, we have now occupied ourselves under the “parasol” on the beach with ecology and peculiarities of some selected fish families.

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Aquarium action day 2014

Aquarium action day for young & old.

This day of action around the aquarium is directed by the stately Natural History Museum together with the Aquarium club Braunschweig e.v.. The day serves both the exchange of experience of experienced aquarist, as well as the information for beginners and incoming aquarium owners.
The program includes exhibitions of aquariums with rare aquarium animals, feed animals with tips on their breeding and aquarium technology, aquarium short lectures, guided tours through the museum’s exhibition Aquarium, an information stand about the aquaria, free water tests, water advice and much more. The normal museum entrance is valid.


Now, we have a new logo:  “GREEN CORALS” !
The old name  “Biologische Meereskunde & Meeresaquaristik” was simply too long… Some have already  showed appreciation for the fact that they don´t need to twist their tongue anymore by speaking this out.
 “GREEN CORALS” is just much more handy.

“GREEN CORALS” includes all our activities concerning marine aquarium keeping, from coral fragmentation, marine aquarium services, water analysis, consultation, through to planning and complete set-up of recirculation units.
 “MARINE BIOLOGY WORKSHOPS“ includes our Marine Biology Workshops, Reef Check, microscope courses, diving, UW photography, lectures and

Business Card

Installation of a coral cultivation facility at GEOMAR, Kiel

Roughly half a year passed by since we projected and built up a closed recirculation unit for the keeping of warm water corals at the GEOMAR in Kiel.
In 2 stages (4 days in all) a fully functioning coral reef aquarium was set up, with a rich stock of corals right from the beginning.
An approximately one year planning phase preceded this.
A former Photo lab was chosen as roomspace and a water-impermeable floor covering was installed.
This considerable facility is needed for diverse current and future research projects, which require the cultivation of reef building corals under controlled laboratory conditions.

Stage 1, 13th/14th May 2013:
During the first stage, the main aquarium (120x60x50cm³) and the filter sump were installed and put into operation: PVC-tubes, pipes and fittings, protein skimmer, aquarium computer with regulation of temperature, automized water refill, pH measuring, insertion of coral sand, construction of reef ceramics, live rock, fill up with both – fresh and mature salt water, and even the first robust pioneers were introduced as well: Various snails, hermit crabs, sea stars, macro algae and some modest soft corals and gorgonians.
Everything went like clockwork, although the 30-hour installation was a real challenge.
In the following, Dr. Isabelle Taubner and Dr. Florian Böhm lead the tank through an eleven-week run-up phase to obtain a biological balance. Since then they have been caring thoroughly for the animals, the technical devices and all relevant water parameters.

Stage 2, 30th/31th July 2013:
During the second stage, the culture tank for coral fragments (120x50x40cm³) was connected to the recirculation system and fish, invertebrates and corals were inserted:
14 fish out of 8 suitable species, shrimps, urchins, sea stars, tube worms, as well as 10 well-grown coral colonies entered the aquarium. Of course that was a real highlight!
The calcium reactor was put into service as well.
Equipped with everything that is necessary for the successful operation of a coral reef aquarium, we talked about everything in detail and finally we even performed a small coral fragmentation workshop.
In the following months the aquaria developed very well. The fish and corals were excellently supplied and fed with high-grade frozen food, plankton and pellet food mostly two times a day.
Despite this quite rich feeding regime the nitrate value remained low and the phosphate value was not even detectable.
The corals are growing excellently and are bright and colourful.
In January 2014 ten more fish and 22 invertebrates were introduced.
We will keep on reporting.