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20g - Angel Fish, Cory Cats, Neons, Mollies
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Discussion Starter · #1 ·
Hi, my name is Alex. I'm beginner, got my aquarium just 2 months ago.
I have 20 gallon tank and species in: Angel Fishes, Black Mollies, Neons, Corycat, Swordtail fish.
I realized that my plants getting lots of black spots on them. It shows only on old leaves, new ones still fine.
Can someone tell me what should I do. Is it kind of Algae? Do I need to get any algae eater fish(shrimp) or apply some medicine to cure?
Photos are attached.

Light Fluid Organism Window Plant
Water Plant Vertebrate Blue Green
Plant Water Botany Natural environment Terrestrial plant
Plant Vertebrate Green Blue Light
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