I have our female Normal Ball in a 20 Long tank and she loves it. My question is what would the best kind of overhead tank lighting or heat lamp should I purchase? Right now im using a zoo med heat pad under her hide, and a 75watt hood fixture laying on the screen cover on the basking side of her enclosure. But at night I feel that it does not stay as warm as it should with the 75watt bulb. Any suggestions wold be appreaciated....