Ahh I bought the same fish and had the same problem, you're in for a battle as mine was quite crafty. However, I'm gonna save you a lot of time an headaches. Get a deecently long piece of pvc
pipe..put some saran wrap on one end held in place with a elastic band. If you plug it wit a pvc
cap its too dark and he won't go in. Put it near his favorite hang out then put food inside at the end with saran wrap. When he goes in for it simply lift the open end up so its standing vertically in your tank, don't panic he can't figure it out to swim up to freedom. Take your time extracting the little sand sifting devil. Bring him back to your lfs
and get your money back.