Here is mine. I think I did it right, but I didn't see the unpublish bar either. I believe I remember it was the same last time.
https://gayauthors.org/story/headstall/within/
I should say some of them do dig through sand, but not as deep or violent as other catfish, and pygmy corys tend to hang out in the middle of tanks, cleaning of plants and rocks. I plan on getting pygmy corys... or possibly panda corys. They sift sand more than dig.
Yes, but it has its own problems, not being suitable for some plants etc. And, it is very expensive, as in astronomical for large tanks like mine. I am doing the Walstadt Method--- where Diane Walstadt recommends organic potting soil covered in two inches of sand. There are variations, with some recommending 3 inches of sand or gravel over an inch to two inches of dirt. I'm going with 1.5 inches of dirt and 2.5 inches of 2mm sand.
I washed dirt today. Yup, that's what I said. I washed and strained 14 small bags of the organic potting soil for my aquarium because it had perlite in it(which is safe but could cause problems later if it escapes the sand cap I am putting on top of it) which floated to the top when I soaked it in water. I think I might have bit off too much.