Explain mulm to me?

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trennamw

Aquarium Advice Addict
Joined
Apr 2, 2014
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Location
Portland, OR
I get that it's a build up of waste ... And is in some instances desirable...

But it's not just piled up fish poo right?

I ask because this interesting thing is happening in my tank, it's mostly sand with some gravel. A few plants. Lots of snails, fully cycled prior to fish.

So at one point I missed a gravel vac by a few days and it looked yucky and then all of a sudden it looked a lot better.

It's white sand, the poo is usually pretty red. It's hit this point where the sand isn't totally white but there's no obvious solid debris. It's like there's a little beige staining sinking into the top of the sand. The color of diatoms but not sitting on the surface like they do.

As I study low tech tanks, Walstad, etc., and add more plants ... I'm inclined to keep letting this go as long as the water parameters are good and it's not ugly?
 
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