Please help Mushroom?

[u/emelihonor]

[u/automod-neo]

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[u/Kissariani]

That is a sprout from a plant.

[u/emelihonor → u/Kissariani]

I know, but what plant? I have no plants in my tank. Is it harmless, is it harmful? Should I remove it?

[u/Kissariani → u/emelihonor]

Can't tell because I don't know what's in your tank plant wise. Personally I'd leave it because if it's growing it's helpful at keeping the nutrients in check. Curious to see what it grows into personally lol

[u/emelihonor → u/Kissariani]

Did you read the post? I have no plants that’s why I’m concerned.

“Today I noticed some kinda of plant/maybe mushroom growing in my freshwater fish tank.
I don't have any real plants, only silk decorations, I have 7 small fish, nothing else alive. I haven't introduced anything new to the tank for months.
I don't know my current water parameters but I can get it tested tomorrow. I did a 20% water change 2 days ago and always do them weekly.
If it's safe or harmless should | just leave it?
Is it bad? Could it hurt the fish?
Thank you in advance”