I use to use the vipar spectra 300w when I first started out and it returned some pretty good results, so I'm sure you'll smash it with the 400w.
So according to an article I just read, coco coir does help water retention. Perlite will help with drainage also.
What ratios did you go with when mixing soil in coco? You can use upto 80% mix of coco, but you will need to flush often as coco will eventually have a salt buildup that needs be rid off.
If I'm being honest mate, without a ph or ec pen you're pissing in the wind, especially if you're using a high mix of coco
Everything seems in order otherwise, just keep an eye on darkening of the leaves as this can indicate nitrogen toxicity, but you have no yellowing of the tips so you're fine for now. Keep feed to a minimum until the plant tells you she wants more
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