Can't tell from the pics, but are the ramps slick? Can they get easy purchase on it to climb up and down? If not, they might not want to use them. If they do climb up and down occasionally, it's just going to take time.
When I put my hairless boy in the 55g tank with the tank girls, he hid for a few days. Now he's always roaming around like he's always lived there. I gave mine a hammock but they tore it up(twice). I'll probably look on ebay for cheap one to try again because they loved climbing on it.
Do they have a hide spot? I made "houses" for my tank out of plastic bowls/tupperware by cutting a doorway and turning them upside down.
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