If I'm going to be honest with you, no, I don't think that's a good idea. I would just plant in pots with normal multipurpose compost.
edit: I assume you want to do that to make things easier for you? If this is the case then I would suggest looking into more workable realistic ideas such as using Autopots. You could have either a two or a three plant kit and under your 250W HPS light it would work perfectly and would make it very easy to look after your plants. Just make sure not to use organic fertilizers in the res.
The great thing about Autopots is you can also use them with coco. Just switch to a coco nutrient solution like Hesi bloom (you just need the bloom despite what the bottles might say). All things being equal people get amazing results with Hesi bloom. The plants just love it and the bud tastes really great with the nutrient.
You could just use coco on it's own of course, by 'bottom feeding' i.e. allowing the coco to soak up the nutrient solution from a tray or you could top feed - both of which need to be done on a daily basis i.e. once a day ideally. If you use pots of potting compost make sure not to use soil that's too hot when they're young. When you're growing out the seeds or even clones, make sure to use a sowing and cutting compost, also called a 'light mix' in the cannabis world. This has less nutrients in it than multipurpose compost. You can use multipurpose compost to start out seeds and clones (hence the word 'multipurpose') as well as to grow out adult plants although when used for adult plants the compost will run out of nutrients faster than potting soil. Potting soil has the most nutrients and is too hot for seeds/cuts but when used for growing out adult plants the plants won't need feeding for a long while.
If you're using soil in pots make sure to 'pot up', which is basically where you grow the seed in a small pot and once you have a lot of roots at the bottom and around the sides (you can tell by taking the rootball out of the pot carefully) you pot it up into a larger pot and repeat. You start off with a small pot for your seed, say the size of a cup and then do as follows:
small seed pot--> 1-1.5L pot --> 3-3.5L pot --> 6L pot --> 11L pot --> 15L pot*
* this is optional if you want to veg it for longer. If you don't want to veg them for that long the last pot can be an 11L pot.
If you're using multipurpose soil or potting soil each time you pot up you have new fresh soil with nutrients and so you won't have to feed, meaning you can just water as usual. After you finish potting up you switch to 12/12 (flowering cycle) since the roots down grow very much at all during the flowering period and so you need to keep them in their final pot. Because you're not potting up during the flowering period you will need to start feeding them - this should be about 2 weeks into 12/12 or two weeks after the last pot up. You use a flowering fertilizer at this point which is higher in phosphorus and potassium but relatively lower in nitrogen. Biobizz fishmix however is a general purpose fertilizer and can be used successfully in both the vegetative stage and the flowering stage unlike other nutrients and is available in the US, Canada and the UK so I would recommend this. If you're in the UK Plant Magic Bloom is one I would definitely recommend. Both Biobizz fishmix and Plant Magic Bloom will feed the beneficial bacteria and fungi in the soil and will improve the effectiveness of mycorrhizal fungi/beneficials mix you add to the planting hold. I might add that these beneficial should be addeded to the planting hold at each pot up - Plant Magic do a product called 'granules' which contains myco fungi as well as other beneficial microbes that help plant growth.
If you're using soil you need to use a wet and dry cycle when watering. This means you let the soil dry out between watering but not so much the leaves wilt. Once you're experienced you can tell when the plants need watering just by the look and feel of the soil surface and by judging the weight of the pot when you lift it by hand. The reason you need to let the soil dry out somewhat is because it allows the roots to be exposed to oxygen in the air. If you water the plants too frequently you can suffocate the roots and stunt growth. Letting the roots dry out too much kills off the importat find root hairs and can also stunt growth and so it's something you need to avoid. In coco as I said, you need to water at least once a day - remember it is not like soil, it's technically hydroponics and so needs to be treated differently. You'll find growth rates are much faster in coco than in soil but it's not as organic as growing in compost with organic nutrients.
