sand or bare glass bottom?

[Aquattro]

Originally Posted by AJ_77

I think it was a wise moderator here who once said, "how can all that trapped black goo be good for my system?"

No, I think I said that.

I went BB on my last tank and loved it, then my new tank I waffled and added sand. After 8 months, I've removed it with all the black goo. It was disgusting!