i dont know about the light, but the whole thing with the glass is over done. i spoke to dr. caldwell and the guy who runs blueboard.com/mantis, while the mantis can break the glass he can also break the acrylic. and this only happens when they get big. they wont just break it for no reason, only if they get annoyed or something. the one thing that you do have to watch out for is dont put a glass thermometer in the tank because it will float around and attract their attention and also if you throw a heater in they will attack it if the orange light comes on. try to get a stainless steel heater where the control is on the wire outside of the tank, i know i cant post the link but there are some doctors named foster and smith that sell a good one like that.