If the water in the aquarium is cloudy, this obstructs the observer’s view. Discolored water can even be really dangerous for the fish. Tips on what to avoid.
Green, white or rather brown – the discoloration of the water can reveal the cause of a problem. Because there are different types of water cloudiness, says Florian Grabsch from the Association of German Aquarium and Terrarium Associations (VDA).
Cloudy water is annoying for aquarium owners because they can better observe their fish in crystal-clear water. The discolouration can even be harmful to residents.
In the short term, it helps to thoroughly clean the outside and inside of the pool glass with a microfiber cloth. Never use glass cleaner.
A dark location and fresh water
In the long term, aquarium owners should investigate the cause.
While green discoloration indicates a floating algae bloom, a whitish discoloration is more indicative of a bacterial infestation.
Placing the tank in a dark place helps prevent algae blooms. Because it is often caused by too much sun. “Even a few minutes of sunlight a day can be the reason for strong algae growth,” says Grabsch. A short flowering period does not harm the animals. But the algae should be contained.
If the algal bloom has already spread and is advanced – you should position the aquarium in a completely darkened position for three days – and also switch off the light. Then you should change the water.
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Avoid turbulence
Suspended matter in the water is usually responsible for a brownish colour.
They often trigger digging fish or crabs that swirl up sludge and substrate. But they can also be thrown up from the ground when you change the water. Too much suspended matter can permanently affect animals and plants.
The expert advises: Wash the substrate thoroughly, remove any mulm and change the water carefully. If the suspended particles occur more frequently, replacing the filter, ideally equipped with filter fleece, can also be the solution.
Act quickly if there is whitish cloudiness
A whitish cloudiness, which usually indicates a bacterial bloom, can be really dangerous. The trigger is usually an excess of nutrients in the water – this can be due to a dead fish or overfeeding.
The bacteria form a white fuzz around the feed that is often mistaken for mold. The problem: The bacterial bloom consumes a lot of oxygen – fish can get short of breath. Again, cleaning the pool and changing the water helps. In the long term you should feed the fish less or differently.
Another tip: Plants can also help to make the aquarium less susceptible to bacterial and algal blooms.