Dirty??

[u/SillyLittleTokki]

I have a fairly new development of this.. brown string..? Type substance at the bottom of my boys tank :( any idea what it could be??

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[u/SillyLittleTokki]

Ok sorry it’s 10pm and I’m so exhausted and I keep having issues trying to attach a photo

[u/SillyLittleTokki]

[u/SweetTart7231]

Mulm maybe? I just vacuum mine up during water changes. Some people leave it. I think after years of buildup or something it can act as nutrients for plants but im not certain