I havn't had to use this yet mainly becouse it just hit me tonight. However if you need emergancy heating then you could place a heat pad in a fishy bag and full of air and place this in the tank. I would keep a close eye on the temp and make sure it doesn't get 2 hot. If the temp drops even more add another. This could give you days of good temp. I would suggest adding a battery powered air pump to keep the water moving and prevent hot spots.
If anyone triies this let us know how it goes.
If anyone triies this let us know how it goes.