I had my 2nd load in for the night last night and the tubes were blowing fire out for about 40 min or so so i took a look up at them because it was looking pretty cool from the recliner and I noticed they were glowing red. 1st year burner here so I dont know if thats ok or what. I looked at them this am and they didnt look deformed at all. Draft control was on low and she was pumping some great heat with just the 4 splits in it packed tight. Opinions?