I am very concerned with the lack of heat our Leo is getting in her aquarium. We have had her for a couple months now and when we first got her it was summer and we could maintain about 90 degrees on the hot side. Now that it's getting cooler, we are struggling to stay at 85. We keep our thermostat set to 73-74. It can be a few degrees cooler in my daughter's room than downstairs. We have a20 gallon that has a footprint of 12" x 24". We have a medium size pad stuck to the underside of the tank on one end, but I can tell the adhesive backing is not keeping it completely stuck to the glass. No stat. We also have a lamp with a black heat bulb. Thanks for any help.