Look at my septic tank - whats in yours?

[Matt]

Originally Posted by Chin_Lee

This is a picture of the bottom of the bucket after I did a quick siphoned cleaning of my BB tanks. This was only a 20g water change. Makes me wonder where all these muck went when there was sand in my tank.......

That is some of the most bioactive goop on the planet, I'd imagine. Unsightly? Yes. Bad? I wonder...