I’ve looked, but it seems most sites say it’s from plants, which I only have plastic plants.
I put an old media from my last tank in there, a rainbow hidey decoration.
The levels are perfect, but these black spots began to appear on the decoration then started growing on the tank wall.
I keep a betta and a baby African Clawed frog in there.
What is it, and how do I get rid of it?
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it can be from ur decorations. as they get old those type things form and just need to be scrubed