So is it used ADA II? I think it would be pretty much impossible to stop a certain amount of it from just becoming a dust like powder. It's not going to keep it's grain. The more you handle it and/or disturb it the more it will bring down.
Honestly I was told that this substrate was fairly new. However I think I mainly got the bottom stuff that was in the tank thats why its mulmy. If I take out some of the mulm there is still a good amount of solid ada stuff.
Perhaps I should Just invest in another bag of ada.
But this loach has got to go. Unfortunatly I dont think I can do cories