You want it out ?? Try a water bottle with some chunky food in it. Sink it in the tank and watch it. See if it wil go in there and them quick take it out. ....... Didnt work for me tho. I was also told a High sided glass will work. Shrimp goes in and cant climb out ??? Again didnt work for me.....
I ended up taking all the rocks and sand out of my tank and going BB like i wanted to any way !