Thanks so much for responding! Ok, I removed the heater and I'll just have to wait until hubby comes home to remove the glass, can't reach it. You guys were right, it wasn't working anyway. Right now it's 70 in the house, but got into the 40's outside last night. It's a 44g hex with a male/female copidichromis borleyi pair, a male/female red zebra pair, and an unknown sex cobalt zebra. Thanks again you guys!
Laura
Laura