Substrate heater installation?
Will it hurt your tank? No, but neither will sending me 20$.
:-) Actually substrate heaters may "hurt" some set ups in hot climates due
to adding more heat. Aquarium coolers are not inexpensive.
If Adam does decide to install the substrate heater in his tank I would just
give him one advice: make sure you secure it very well to the bottom. Don't
rely on the suction cups alone.