I won't say it looks "normal" for that age, you can definitely tell it was stunted. I can also tell just by that picture that the media is
entirely too dry. You want to be keeping coco between 90-100% saturation which means watering to run-off (10-20% run-off by volume) at least once a day in most situations. Unfortunately that 5 gallon container may not have been the best choice.
You're asking that plant to build a root system in that 5 gal container, which it will try to do before it pours energy into above-ground growth. The larger the container, the longer it takes the plant to fill out its root system, which means it will take even that much longer to fill out above-ground. A 5 gal container is going to be massive for a plant that size, so while that plant is spending time and energy filling out its root system you are going to continue to see subpar above-ground growth. If you're going to stick with this plant, that's fine, but then just be mentally prepared for that fact.
This relative mismatch in size also means that you will need to saturate your media incredibly thoroughly to ensure the very small space occupied by your rootzone actually gets the nutrients it needs. You could be using a gallon of solution a day to completely saturate that pot; it quickly becomes clear why that is not commensurate to the size of the plant itself. It's my general opinion that for most (coco) situations a 3 gal is better than a 5 and even then, the plant is still transplanted up multiple times to build a large, healthy rootzone first.
As for nutrients, I also use GenHydro Flora 3-part plus
CalMag and Si. Personally, I follow a reduced version of GenHydro's weekly feed chart, typically 70-75% of the "Light" feed numbers, and then I use the Coco For Cannabis nutrient chart to get the
CalMag/Si amounts as well as my target EC/pH for the week. I reduce the GenHydro nutrients proportionally like that because otherwise the EC would come out way over target. EC is everything in coco, if you don't have an EC meter you're flying blind. Don't worry about or bother using PPM or TDS scales; these are just estimated scales that derive from EC anyways.
I won't lie, you are in like exactly the same situation I found myself in on one of my first coco grows. I thought I was clever going into a 5 gallon pot early and it ended up just being a complete waste of time and money. I ended up just calling it a learning experience, axing that plant and starting over. With everything I learned over those failures this is what I have going now, day 14 Durban Poison.
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This went from a 1/4 gal bag to the 1 gal its in now before it eventually ends up in a 3 gal fabric pot. Those smaller pots/transplants up are incredibly necessary to make sure it actually has the gas to continue in that 3 gal pot unabated. But man once you get all this shit dialed in, coco is absolute jet fuel for your grow I tell you what.
