Black pepper spots on your aquarium plants may seem harmless but they are early indicators that something is wrong with the aquarium environment. In most cases these small spots are visible bacteria or algae, and while they are safe in small quantities, they can be lethal to your fish if left unchecked. If you start seeing lots of these spots, take the appropriate steps toward restoring balance in your aquarium to avoid any problems.
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Black pepper spots on your plants are usually visible bacteria or algae, tiny aquatic organisms that thrive in certain conditions. Excessive light, particularly direct, prolonged sunlight, causes spots on plants because the tiny organisms are allowed to perform photosynthesis at a rapid pace. Nutrient imbalances in the water can also lead to algal and bacterial growth. Overfeeding can cause such imbalances. The uneaten food sinks to the bottom and winds up feeding the algae and bacteria instead of the fish. Infrequent or improper aquarium cleaning can also create an atmosphere in which these unwanted organisms can grow.
Excessive algae and bacteria in the aquarium can lead to the death of fish rather quickly. These tiny organisms consume valuable nutrients in the tank and produce an excess of oxygen in the water, a deadly combination for sensitive fish. Algae and bacteria can also harm or inhibit the growth of live plants living in the water.
To check for black pepper spots, simply inspect the plants in your aquarium. You may need to hold up a flashlight to the tank if the light levels are very low in the room. Check the gravel, rocks, ornaments and glass for black pepper spots, as they often spread from plants to these other parts of the aquarium.
With live plants, there is only one way to remove black pepper spots for good: remove the affected plants and replace them with healthy plants. If you have plastic plants, remove them from the aquarium and scrub them with a mild antibacterial detergent or disinfectant. Let the plastic plants dry in the sun, rinse them thoroughly again and return them to the tank.
A number of factors can help prevent black pepper spots on your aquarium plants. Adjust the light levels or move the aquarium so that it receives less sunlight or artificial light. Check the aquarium's filtration system to make sure it's functioning properly. Also check the pH and nitrate levels in the water, as imbalances can lead to bacteria and algal growth. Consider introducing some algae-eating organisms, such as Siamese algae eater, amano shrimp, oto catfish and Malaysian trumpet snail.
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