Feb 01

Lake Malawi biotope aquarium

Lake Malawi biotope

Malawi biotope aquarium with algae on rocks

Malawi biotope aquarium with algae on rocks

Reasons for creating a Lake Malawi Biotope

Now more than ever, is a good time to set up a natural biotope of Lake Malawi. For instance, there is a lot of information on the behaviour and environment of most species inhabiting Lake Malawi. Which means we can recreate conditions in the aquarium, that are very close to those found in Lake Malawi.

Another reason is that with the discovery of oil in Lake Malawi, the ongoing destruction of the habitat in and around the lake is increasing. This is causing the near extinction of many species of fish and plants. How does setting up a Malawi Biotope aquarium help this, you may ask? In conservation, it is only species that people are aware of that get saved. And so if many aquarists set up a Lake Malawi biotope then what better way of showing what beauty will be destroyed by showing off their aquariums. The press can be invited to see the natural beauty of fish from Lake Malawi and told about which species are facing extinction in order to raise awareness and save the lake.

A final reason is that the fish can be observed in something that approximates their natural environment. The fish will of course be happier and you, the observer, will get to see the full range of natural behaviours and interactions between the fish and their environment. The fish will naturally try to inhabit the same niche in the biotope aquarium that they would normally inhabit in the wild, instead of being forced to lump it with other species that they would normally avoid.

How faithful a Malawian biotope can be created?

Recreating a Lake Malawi Biotope that is absolutely accurate down to the`smallest detail is an impossible task. But we can go a long way to recreating something that very closely resembles the lake. We can also very closely recreate the same water parameters, lighting, rocks and sandy base. Recreating the muddy parts of the lake would requre a very large aquarium, such as a public aquarium. So is not really feasible in the home aquarium. Luckily there are lots of sections of lake Malawi that are just rocks and sand, just rocks mostly or just sand mostly. These we can recreate in the aquarium.

Different approaches to building a Malawian biotope

There are possibly two approaches to recreating the biotope. The first way is to base it around the fish species in your possession or that you intend to buy. Then it would be a matter of researching to find out which environment your fish live in and if they are compatible. Then you would have to recreate a biotope that best accommodates your particular set of fish.

The second approach is to have a look at many pictures of lake Malawi in order to choose a scene that you particularly like. Then recreating that scene in the aquarium. Once that scene has been created then it would be a matter of finding which species would comfortably fit in your biotope and going out to buy them.

If you have species that inhabit different environments within the lake, then you need a very large aquarium to try and accommodate them all. Lake Malawi divides into two areas mostly with an open sandy region broken up with a few scattered rocks and a dense rocky area with many hiding places consisting of caves and crevices.

Aquascaping your Malawi biotope aquarium

Typical hobbyists biotope aquarium

Typical hobbyists biotope aquarium

The base is going to be a layer of sand of about 3 inches in depth. Most normal sands are fine, even crushed coral sand should be fine. However, wash well because sand creates more cloudiness than gravel.

Your rock choices are limestone and sandstone. The sand comes from the sandstone in the lake. Limestone is present in the lake also and gives the lake its ph and hardness. The sandstone can be the golden type or a grey type. Choose types of various sizes with smoothed edges. Algae will also grow quite well on these types of stone.

Arrange the stones in your aquarium so that caves, crevices and hiding places are created. Leave an open space of sand in the front of the aquarium. Scatter a few smaller rocks around the sand but separate from each other.

The rocks at the back need to be stacked up along the back so that they reach the surface and even break the surface of the water in places. To ensure the safety of your glass and fish, use silicone to glue rocks together to create a stable rock formation.

Plants and other creatures

planted rocky malawi aquarium

Atypical planted rocky malawi aquarium with sand substrate

Besides the fish there will be algae and small insects and invertebrates. Since many species from lake Malawi feed off snails then including snails in the aquarium is a good idea. Try apple snails that are native to lake Malawi or snails that are similar to those of lake Malawi such as snails of the genus bulinas. Obtain snails that look and behave similarly that can live in hard water.

Most mbuna species feed off the algae growing on the rocks and the micro organisms growing in the algae. In the sand will be worms and other insects that the Auloconara species(peacock) feed off. Trying to find suitable creatures that will live, grow and reproduce in the sand is a difficult task. You risk the creatures dying and polluting the sand and the aquarium. In the wild it would be these creatures that would dig through the sand that prevents the sand in the wild from compacting the way it does in the aquarium.

Insects found in lake Malawi include water bears, daphnia, cyclops. Create a separate culture of these and feed the fish. These will be native food for your Malawi fish.

There are few plants in lake Malawi so you do not have to have any plants in the aquarium. But valisneria and hornwort are a possibility that do occur in lake Malawi. Plant singly and sparsely.

Which fish to have in a Malawian biotope

Malawi biotope typically found in public aquariums

Malawi biotope typically found in public aquariums

Mbunas are perfect for the rocky parts of the biotope. One or two species will quickly set up home and create territories within the rocky structures, each fish with its own little cave or crevice. Aulonocara species like open waters above sand but not too far from rocks. One or two species will be great for the open, sandy areas. They feed off insects that they can find in the sand. The aggressive mbunas will only rarely venture out from their rocky area while the Aulonocara will avoid the rocks.

In a large enough aquaria with distinct areas the two groups of fish will approach each other and there will be aggression but the fish usually retire to their own habitat.

If your aquarium is not too large then you will have to settle for one group or the other. If you settle for auloconara then you shouldn’t have a large rocky formation. A smaller rocky set up is better for them. Aulonocara do like to swim in open spaces. However, aggression between the fish means that they too need hiding places.

Finally, it is an aquarium so run it like one

You can buy Malawi salts to recreate the exact water found in the lake. However, don’t just add it to tap water. Tap water already has some hardness and minerals which you will have to take into account. SInce you are creating a biotope you should use a reverse osmosis filter to remove all minerals from your tap water then add your Malawi salts to get the correct hardness and ph. For tap water you will obviously have to reduce the amounts of Malawi salt per litre. This is best done by testing your water after adding a half dose to tap water. If it comes out too hard reduce the amount of salt used. If not hard enough increase the amount of salts.

You need good quality lighting that will encourage rock algae without causing an algae bloom. Also, too bright a light will spook the fish. In lake Malawi the waters are not pristine and there is a little murkiness there. This is where most aquarists depart from the strict biotope by having pristine water.

The ecosystem however needs some way to operate the nitrogen cycle without plants. This means that you will have to have powerful biological filters that have a high turnover of water and a filter media with a large surface area for the nitrifying bacteria to grow on.

Water changes are also a necessity. While some may consider this as cheating, you may want to consider the real lake Malawi. There is an inflow of fresh water from the Ruhuhu river. And the lake is vast giving a lot of scope for de-nitrification.

If you have followed these guidelines, the end result should be a pleasant aquarium full of colourful fish. It should look like a piece of lake Malawi. So, sit back and enjoy your hard work.

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