I failed miserably at my first attempt to somewhat force my Yasha pair and pistol shrimp to use the DIY burrow. I used a tao hui tub, cut a hole and placed the trio with the hole of the container towards the burrow. The shrimp escaped before I could even reach the burrow, and the size of the cut out was too big, so the Yashas eventually explored every other area EXCEPT where I want them to be. I left them on their own, but it bugs me not to be able to watch them at all, which completely defeats the original purpose of having the DIY burrow.
While removing the rocks and Dum Dum for the scrub, I discovered that one of the Yashas didn't make it. I removed the remaining Yasha, the pistol shrimp, and devised attempt No. 2. I cut one 1.5l bottle in half and use it as a funnel. This helped to guide the pair to the burrow without much problems.
Here are some peekaboo pics. I still want a pair of Yashas, so I'll be looking out for a replacement as soon as shipment comes.