Advertisement I recommend 70/30 peat/vermiculite. The vermic really helps the tall soil stay hydrated. Pure peat would probably be fine too. I would not recommend sand but I don't see why it would cause a rejection. I personally would remove spider (its already stressed being out and about) and re-substrate with no sand. I would use a broom handle or something similar to make a deep burrow that the spider can just walk into and web up. Maybe someone already asked this, but have you checked the pedipalps to see if this is a mature male?