That is great advice. I have never heard of oiling the top of the tub. Do you just use mineral/baby oil?...when rehousing in the future, you can put a lining of oil on the top of the tub to keep them contained, and just have a catch cup you can use to put them in their new home. It's probably near impossible to rehouse like you would with other species. You can't just coax it to move from one container to the next.