My guess is that you are getting a static shock from the furnace. The dust and dirt inside your furnace will collect and hold a static charge. Try putting somthing between the pipe that touches your furnace door. The pipe that touches the furnace door, what is it made of ? is it pex ? polyb ? cpvc ?
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Starting fresh ... 90 gal, 40gal sump, sundial T5HO x 4, 2 x koralia 2's, ASM G1X skimmer 
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