Hello,
Grammostola porteri is a difficult species . In the summer, the best temperature is between 22 and 28 °C / day and 18 - 22 °C / night, as well as DRY CONDITIONS (maybe 65 - 70 % humidity) . In the Winter they need low temperatures ( 8 - 15 °C ) day and night, and HUMID CONDITIONS ( 80 % or more humidity).They like large quantity of forest soil in the terrarium. GOOD LUCK.
Flo.
