It depends on the size of the O. scyllarus. if it is larger than 13 cm, I would not keep it in this size glass tank unless it has unusually thick glass. The standard tank this size could be broken. While rare, an animal this size can break glass. This usually happens when the animal tries to dig and hits the bottom or corner. It's normal response in the field is to try to break the obsruction. It will strike repeatedly at the glass and may chip it. O. scyllarus usually do not have protracted fights, so a break due to striking a reflection is rare. I have seen a couple of cases where an animals was being teased by a finger moving on the glass and the animals struck and cracked the glass. However, this is controlable - don't tease the mantis.
Roy