Just bought 3 yo-yo loaches (Will be getting 3 more soon ) .
Now I know they like to burrow and I have black Eco-complete substrate. Which to me is kinda sharp so I want to make them a sand pit with play sand I got from Home Depot. Any experience with this or advice?
Should I keep the sand in a seperate container or I've seen people make one end of their tank sand but i dont know what black substrate tailing off into sand would look like.

Thoughts?