I figured out why my little guy is doing a head jerk he's trying to breath he has a runny nose. when it started to get pretty cold here I moved him out to the living room where its warmer. And at first I was using one 75W bulb for heat now I'm using two 75w bulbs both at the same end so he has a warm end and a cooler end. Only on 75w bulb is on at night. I put one of those temp readers that I got at wal mart and put the wire right under his lights on the ground and its been about 15 min its reading 101.8 so it has to be warm enough. Maybe I didn't start the two light bulbs soon enough? This is the second time he has been sick. I feel like a bad Mom. Do you think it's because I still have him in a 55 gal tank. I have been watching the stores for the big xmass tree bins, there still not out yet. My husband thinks I should rehome him to someone that can keep him healthy. I really don't want to. What is the main cause for runny nose? Thanks for any help.