One point l feel has been missed is what about the neonates that are strong apart from a dislodged or deformed egg tooth, l have seen "well formed" robust hatchies suffocate and die through not be able to emerge from their egg.
l tried for a couple of seasons a good while back pipping on temp. rise for no apparent gain, these days l think like as slimbo said l cut a " small" v in the highest part of the egg of the rest after the 1st. one pips and for me l reckon l will stick with this method.
People on this thread can say about it not being natural but can these herpers point out what is "natural" in our hobbie, plus l personally feel sick in the stomach to see a drowned fully formed hatchie but alas has a dislodged or deformed egg tooth which falls away within 24 hours of hatching....but at the end of the day everybody has a point of view.
..........solar 17 (baden)