New to growing cannabis. Started with a few autos and a few photos this year. Photos are doing awesome and all but one auto is doing good. I decided to grow in a few mediums to see what I liked best. The one I’m having troubles with though is in a 1/4 perlite, peat, compost and manure mix. This is what the guy at the shop I bought the seeds from said worked best with autos. Basically sow the seed and water is all I needed to do. Well I also did some LST and the plant was looking really healthy. Then it started flowering. About 60 days in. About a week into flowering I had my lower leaves turning yellow. Thought maybe lack of light. Then it started moving up the plant. I did some research and started thinking either nutrient lock or lack of nitrogen even though the store told me I wouldn’t need to fertilize. So I decided it was a lack of nitrogen and watered with worm castings tea and some 1/2 strength bloom GH nutes (what I’m watering my healthy auto in coco with). Was this the right call? It’s hard to see photos of nutrient lock and lack of nitrogen as to me they seem very similar.