Long sprouted seedling

No, it is not a bad "pheno" but usually a lighting problem. Either have your light at 100% or if it already is, it needs to be lower, somewhere in the 18-24 inch range. I have found that if your LED has two options, that is, a switch for veg and a switch for bloom, having both veg and bloom switched on together, can result in stockier growth. The fact you have your lights on for a totally unnatural 24 hours could also be a contributing factor. The seedling may actually be in "shock" due to having no dark period. All plants, including cannabis, need to "sleep", to undertake certain metabolic processes that the plant can not do during the lights on cycle. By having your lights on for ever, with no night cycle, is in my opinion, plant torture. Regardless of what you have read or been told, cannabis can only grow so much in any 24 hour period and this growth potential tops out at around 18 hours, so running your lights any longer than 18 hours, is basically a waste of electricity. Your cannabis plants need sleep, period. They will be far healthier and happier with an 18/6 schedule, with almost identical growth to the torture of 24 hour light. The six hours "sleep" can be likened to - 2 hours to rest, 2 hours to repair and 2 hours to get ready for the day ahead. The 18/6 light schedule, for either photoperiod or auto flowering cannabis has been derived at from over 80 years of scientific research and is not a random number. Like I said, cannabis, of any sort, can only grow so much during any 24 hour period and that growth tops out at around 18 hours. Any longer light cycles such as 20/4 or 22/4 or the totally unnatural 24/0, and you are getting very little real, extra growth, as compared to 18 hours. So unless your electricity is free, running your lights longer than 18/6 is pointless, given that plants DO NEED to "sleep" and no great increase in growth is achieved over the 18 hour thresh-hold. Your plants will be much happier and healthier with better growth and superior flowers being produced if subjected to a cannabis friendly 18/6 light/dark routine, rather than being thrashed at 24 hours whereby you will most likely end up with tired, thrashed out flowers with incomplete cannabinoids and terpenes due to the plants not having the proper "sleep" they need. Nowhere on planet Earth has any plant ever evolved with 24 hour light. Thrashing your plants at maximum speed will lead to something giving up/breaking. I have seen some horrible pictures in this forum of horrible flowers, being the result of continuous 24 hour light, with rather guilt ridden growers wondering if anything can be done to rescue the flowers they have spent the last 3-4 months looking forward to and now realising that they should have never gone with the 24/0 cycle, with the end result generally being horrible plants and horrible flowers. The fact that they only try this plant torture routine once, tells me that it really is a bad idea to grow cannabis without a "sleep" cycle. Besides all the scientific research that has come to the conclusion, over hundreds if not thousands of experiments, that have determined cannabis grows its best and healthiest, with an 18/6 light/dark schedule. People who push their plants at extended light schedules, are, in my opinion, unsympathetic growers who are interested in growing "product", with little understanding of cannabis plants, and will never grow flowers to be truly proud of, that have come from happy and healthy plants that have been growing in a loving environment with loving owners who truly care about their plants health and wellbeing. Sorry for the side tracked lecture, but no cannabis plant, in my opinion, should ever be tortured with 24 hour light! Burying it deeper is a good remedy for what has happened, but to prevent it from continuing, you will have to either lower your lights a bit, or run it at 100% if you are not already doing so. Also trying with both the veg and bloom lights switched on together, if you light has this function, may also help with reducing the stretched growth. Hope this helps,......... Organoman. (and self proclaimed Universal protector of cannabis plants!)