soil layer Q
Well, I finally caved and got another betta (it's been a couple years since I had one), which has brought me back to the forum that started it all- my multi-tank syndrome, planted tanks and my fish geekness :) I have a soil-under-black-diamond-blasting-sand planted 20g tank that's about 4 years old and generally doing well with very little caretaking on my part.
The soil/sand layers have somewhat mixed over time, and there is a dusting of soil visible on top of the soil in various areas around the tank. Should I lay down another layer of black diamond? If so, how thick? Or just ignore it? [possibly related: The water column is clear, but when I clean the tank and squeeze out the sponge filter in a bucket of the old tank water, lots of dark stuff that looks like it might be soil is released.]