that black green stuff is called algae and you can get an aglae scrapper or a algae eater sometimes snails csn eat the algae too.
good luck!
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Kevin's (My) Tanks
10 gallon tank - 8x Almost 1 month Guppy fry
10 gallon planted tank-3x guppies
30 gallon-5x White Clouds-4x Otos
53 gallon tank -5x neon tetras-6x Cherry Barbs-2x Peppered Cories
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