I had five loaches for about 2 weeks, tiny babies bout inch big + . I had hollowed out driftwood, and a rock cave and another cave, and yet i always saw them out and about. They like to chomp on my plants, i would replant and replant and next day plants would be floating again. At first they were shy like for two days they just wedged themselves anywhere and never came out, but after they swam everywhere. Give em time, and happy and they should come out.